The accuracy of travelling microscope is of the order of:
- A0.01 cm
- ✓0.01 mm
- C0.1 mm
- D0.1 cm
Answer: B.
View full solution →Question types
Optics question types
248 questions across 8 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
248
Questions
8
Question groups
5
Question types
01
Choose the most appropriate answer from the given alternatives and write the option code and the corresponding answer.
88 Q→02Fill in the blank
66 Q→03True-False
30 Q→04Assertion & Reason
10 Q→05[2 Mark Questions]
10 Q→06[4 Mark Questions]
29 Q→07Match The Following.
7 Q→08[7 marks Questions]
8 Q→Sample Questions
Optics questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
The magnifying power of compound microscope is:
- A10
- B20
- C50
- ✓50 to 200
Answer: D.
View full solution →Astigmatism can be corrected by using:
- Abifocal lens
- ✓cylindrical lens
- Cconvex lens
- Dconcave lens
Answer: B.
View full solution →Presbyopia can be corrected by using:
- Aconvex lens
- ✓bifocal lens
- Cconcave lens
- Dcylindrical lens
Answer: B.
View full solution →In hypermeteropia, the focal length of the eye lens is:
- Adecreased
- Bremains the same
- ✓increased
- Dnone of the above
Answer: C.
View full solution →Elaborate view of galaxies and planets is obtained by ………
A terrestrial telescope produces ……… image.
……… is an optical instrument to see the distant objects.
The focal length of ………. is greater in a compound microscope.
The objective of the compound microscope has …………. focal length.
Astigmatism is corrected by cylindrical lenses.
For a normal human eye, the value of far point is 25 cm.
Pupil of human eye bends the incident light on to the lens.
When an object is placed at finite distance from the concave lens a virtual image is formed between optical centre and focus of the concave lens.
In front of a convex lens when the object is placed at infinity the formed image is smaller than that of the object.
Assertion: Presbyopia is due to ageing of human beings.
Reason: For those persons, ciliary muscles of the eye become weak.
Reason: For those persons, ciliary muscles of the eye become weak.
- ✓If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- BIf both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
- CIf Assertion is true but Reason is false.
- DIf Assertion is false but Reason is true.
Answer: A.
View full solution →Assertion: Power of a lens is the reciprocal of its focal length.
Reason: The unit of power is one dioptre when the unit of focal length is one metre.
Reason: The unit of power is one dioptre when the unit of focal length is one metre.
- ✓If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- BIf both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
- CIf Assertion is true but Reason is false.
- DIf Assertion is false but Reason is true.
Answer: A.
View full solution →Assertion: Raman scattering the scattering of monochromatic light by atoms and molecule of a liquid.
Reason: The wavelength of Raman lines is same.
Reason: The wavelength of Raman lines is same.
- AIf both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- ✓If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
- CIf Assertion is true but Reason is false.
- DIf Assertion is false but Reason is true.
Answer: B.
View full solution →Assertion: Light waves travel in straight lines.
Reason: Rectilinear propagation of light confirm the above mentioned properly.
Reason: Rectilinear propagation of light confirm the above mentioned properly.
- ✓If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- BIf both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
- CIf Assertion is true but Reason is false.
- DIf Assertion is false but Reason is true.
Answer: A.
View full solution →Assertion: If a convex lens is placed in water, its convergence power decrease.
Reason: Focal length of lens is independent of refractive index of the medium.
Reason: Focal length of lens is independent of refractive index of the medium.
- AIf both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- BIf both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
- ✓If Assertion is true but Reason is false.
- DIf Assertion is false but Reason is true.
Answer: C.
View full solution →Why are traffic signals red in colour?
Why does the sky appear blue in colour?
What are the causes of ‘Myopia’?
What is the power of accommodation of the eye?
Differentiate convex lens and concave lens.
An object 2 cm tall is placed 10 cm in front of a convex lens of focal length 15 cm. Find the position, size and nature of the image formed.
The radii of curvature of two surfaces of a double convex lens are 10 cm each. Calculate its focal length and power of the lens in air and liquid. Refractive indices of glass and liquid are 1.5 and 1.8 respectively.
The optical prescription of a pair of spectacle is
Right eye: -3.5 D, Left eye: -4.00 D.
(i) Name the defect of the eye.
Right eye: -3.5 D, Left eye: -4.00 D.
(i) Name the defect of the eye.
A ray from medium 1 is refracted below while passing through medium 2. Find the refractive index of the second medium with respect to medium 1.
A 3 cm tall bulb is placed at a distance of $20$ cm from a diverging lens having a focal length of $10.5$ cm. Determine the distance of the image.
View full solution →Match the Column I with Column II.
Match the column I with column II.
Match the Column I with Column II.
Match the Column I with Column II.
Match the following:
Write short notes on
(i) Astronomical telescope
(ii) Terrestrial telescope.
(i) Astronomical telescope
(ii) Terrestrial telescope.
Describe simple microscope.
With the help of a diagram, explain the structure and working of human eye.
Explain Mie Scattering.
Explain the formation of images formed by a concave lens.
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