The phenomenon of light passing through the object is called ……………..
- AReflection
- ✓Refraction
- CDispersion
- DTotal internal reflection
Answer: B.
View full solution →Question types
Light. question types
104 questions across 9 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
104
Questions
9
Question groups
5
Question types
01
M C Q
17 Q→02Fill in the blank with correct answer.[1 Mark each]
18 Q→03true or false.[1 Mark each]
8 Q→04Assertion & Reason
4 Q→05[1 Mark Questions]
12 Q→06[2 Mark Questions]
29 Q→07Match The Following.
4 Q→08[4 Mark Questions]
10 Q→09[7 marks Questions]
2 Q→Sample Questions
Light. questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
In the head lights of motor vehicles, ……………… mirrors are used as reflectors.
- APlane mirrors
- BConcave lenses
- CConvex mirrors
- ✓Concave mirrors
Answer: D.
View full solution →Incident angle of a ray of light is 30°. The angle between the incidend ray and the reflected ray is …………….
- A50°
- B90°
- ✓60°
- D15°
Answer: C.
View full solution →The velocity of light in vacuum is $3 \times 108 ms^{-1}$ and in glass is $2 \times 108 ms^{-1}$. The refractive index of glass is .
- A2
- ✓1.5
- C1.8
- D1.33
Answer: B.
View full solution →Reflection by a looking mirror is called …………….
- ✓Regular reflection
- BIrregular reflection
- CRegular and irregular reflection
- DNone of these
Answer: A.
View full solution →The ……………. is an optical device with a polished surface that reflects the light falling on it.
The …………….. of a mirror determines the type of image it forms.
…………….. mirrors form the perfect image of an object.
The image formed by convex mirrors is ……………… than the object
……………… mirrors magnify the object placed close to them.
The most common example of a convex mirror is the make – up mirror.
A thin layer of molten aluminium or silver is used for coating glass plates that will then become mirrors.
Curved mirrors produce images that are either enlarged or diminished.
Curved mirrors form the perfect image of an object.
Curved mirrors have surfaces that are spherical, cylindrical, parabolic and ellipsoid.
Assertion : We can see the rainbow in the sky when the rain starts falling after a spell of bright sunlight.
Reason : The rainbow is formed due to the dispersion of light.
Reason : The rainbow is formed due to the dispersion of light.
- ABoth assertion and reason are true and the reason is the correct explanation of the assertion.
- BBoth assertion and reason are true, but the reason is not the correct explanation of the assertion.
- CThe assertion is true, but the reason is false.
- ✓The assertion is false, but the reason is true.
Answer: D.
View full solution →Assertion : The mirrors used in search lights are parabolic and not concave spherical.
Reason : In concave spherical mirror the image formed is always virtual.
Reason : In concave spherical mirror the image formed is always virtual.
- ABoth assertion and reason are true and the reason is the correct explanation of the assertion.
- BBoth assertion and reason are true, but the reason is not the correct explanation of the assertion.
- ✓The assertion is true, but the reason is false.
- DThe assertion is false, but the reason is true.
Answer: C.
View full solution →Assertion : Convex mirrors are used as rear view mirror in vehicles for observing traffic at our back.
Reason : A convex mirror has a much larger field of view.
Reason : A convex mirror has a much larger field of view.
- ✓Both assertion and reason are true and the reason is the correct explanation of the assertion.
- BBoth assertion and reason are true, but the reason is not the correct explanation of the assertion.
- CThe assertion is true, but the reason is false.
- DThe assertion is false, but the reason is true.
Answer: A.
View full solution →Assertion : A ray incident along normal to the mirror retraces its path
Reason : In reflection, angle of incidence is always equal to angle of reflection.
Reason : In reflection, angle of incidence is always equal to angle of reflection.
- ✓Both assertion and reason are true and the reason is the correct explanation of the assertion.
- BBoth assertion and reason are true, but the reason is not the correct explanation of the assertion.
- CThe assertion is true, but the reason is false.
- DThe assertion is false, but the reason is true.
Answer: A.
View full solution →The angle between incident ray and reflected ray is 60°. What is the value of angle of incidence?
Name the two types of spherical mirrors.
Light bends as it passes from one medium to another. What is this phenomenon called?
What is the composition of sunlight?
Name the triangular piece of glass that splits white light into different colours.
Car rear view mirrors carry a warning message that “objects in the rear view mirror are closer than they appear”. Why do you think this is so?
If all objects around us were to reflect light in a regular way, what problem might we face?
What is a virtual image? Give one situation where a virtual image is formed.
What is the difference between virtual images of an object formed by a concave mirror and a convex mirror?
A safety vest helps to keep the workers who are working by the roadside safe. This especially so during the nights. Why?
| i | Mirror | (a) | Used by dentists to see enlarged image of teeth. |
| ii | Virtual image | (b) | Can be taken on a screen. |
| iii | Real image | (c) | Cannot be taken on a screen. |
| iv | Convex mirror | (d) | An optical device which produces reflection. |
| v | Concave mirror | (e) | Can form image of objects speed over a larger area |
| i | The ray that enters the transparent medium | (a) | Violet |
| ii | The ray that comes out from a transparent medium into air | (b) | 0^(@) |
| iii | Speed of light in vacuum | (c) | Emergent ray |
| iv | The angle of incidence for normal incidence | (d) | Incident ray |
| v | The colour that deviates the most | (e) | $3\times10^{8}m/s$ |
| i | Real image | (a) | Distance between pole and centre of curvature. |
| ii | Virtual image | (b) | Centre of the sphere of which the mirror is a part. |
| iii | Focus | (c) | Line passing through the pole and focus. |
| iv | Principal axis | (d) | Erect |
| v | Centre of curvature | (e) | Inverted |
Match the following.
| Convex mirror | Radio telescopes |
| Parobolic mirror | Rear – view mirror |
| Snell’s law | Kaleidoscope |
| Dispersion of light | sin i/sin r =μ |
| Refractive index | Rainbow |
Explain the images formed by a convex mirror for different position of the object.
Explain the uses of periscope.
Explain the construction, working of periscope with a neat labelled diagram.
Explain the construction and working of kaleidoscope.
Cross word puzzle :
Across:
3. The geometrical centre of a spherical mirror.
6. Centre of the sphere from which the mirror is made.
7. An optical device with a polished surface that reflects the light falling on it.
8. Image which can be formed on a screen.
9. Image which cannot be formed on a screen.
10. The bending of a light ray when it passes from one medium to another medium of different density.
Down:
1. Mirror which converges a parallel beam of light passing through it.
2. Imaginary line passing through the centre of curvature of the mirror.
4. Mirror which diverges a parallel beam of light passing through it.
5. The formation of rainbow is an example of ______.
Across:
3. The geometrical centre of a spherical mirror.
6. Centre of the sphere from which the mirror is made.
7. An optical device with a polished surface that reflects the light falling on it.
8. Image which can be formed on a screen.
9. Image which cannot be formed on a screen.
10. The bending of a light ray when it passes from one medium to another medium of different density.
Down:
1. Mirror which converges a parallel beam of light passing through it.
2. Imaginary line passing through the centre of curvature of the mirror.
4. Mirror which diverges a parallel beam of light passing through it.
5. The formation of rainbow is an example of ______.
Explain the working of a periscope.
Generate a Light. paper free
Pick question groups from the list above, set marks and difficulty, and export a branded PDF with step-by-step answer keys. First 3 chapters free — no signup.