P-1 Refraction of light - Maharashtra Board STD 10 Science Questions

Q 1M.C.Q1 Mark

If we gradually increase the angle of incidence of a ray of light passing through a prism, then…………..

A
the angle of deviation goes on decreasing
✓
the angle of deviation decreases but after certain value of incident angle, deviation angle increases
C
the angle of deviation goes on increasing
D
the angle of deviation increases but after certain value of incident angle, deviation angle decreases

Answer: B.

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Q 2M.C.Q1 Mark

In refraction of light through a glass slab, the directions of the incident ray and the refracted ray are…………

A
perpendicular to each other
B
non-parallel to each other
✓
parallel to each other
D
intersecting each other

Answer: C.

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Q 3M.C.Q1 Mark

A glass slab is placed in the path of convergent light. The point of convergence of light:

✓
moves away from the slab
B
moves towards the slab
C
remains at the same point
D
undergoes a lateral shift

Answer: A.

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Q 4M.C.Q1 Mark

A ray of light makes an angle of 50° with the surface S1 of the glass slab. Its angle of incidence will be………….(March 2019)

✓
50°
B
40°
C
140°
D
0°

Answer: A.

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Q 5M.C.Q1 Mark

………..light is deviated the least in the spectrum of white light obtained with a glass prism.

✓
Red
B
Yellow
C
Violet
D
Blue

Answer: A.

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Q 6Answer the following questions:[1 M]1 Mark

What is a prism?

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Q 7Answer the following questions:[1 M]1 Mark

The change in…………of light rays while going from one medium to another is called refraction.

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Q 8Answer the following questions:[1 M]1 Mark

Refractive index depends on the………….of light.

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Q 9Answer the following questions:[1 M]1 Mark

Reflection, Neutralization, Refraction, Dispersion.

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Q 10Answer the following questions:[1 M]1 Mark

In dispersion of sunlight by a glass prism,………..ray is deviated the least.

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Q 11Give scientific reasons: [2 M]2 Marks

If the absolute refractive indices of glass and water are $\frac{3}{2}$ and $\frac{4}{3}$ respectively, what is the refractive index of glass with respect to water?

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Q 12Give scientific reasons: [2 M]2 Marks

If the speed of light in a medium is $1.5 \times 10^8 m / s$, what is the absolute refractive index of the medium? (Practice Activity Sheet - 1 and 4 )

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Q 13Give scientific reasons: [2 M]2 Marks

The sun is seen on the horizon a little before sunrise.
(OR)
The sun is seen on the horizon for sometime even after sunset.

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Q 14Give scientific reasons: [2 M]2 Marks

While shooting a fish in a lake, the gun is aimed below the apparent position of the fish.

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Q 15Give scientific reasons: [2 M]2 Marks

The bottom of a pond appears raised.

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Q 16Answer the following questions: [2 M]2 Marks

If the refractive index of a rarer medium with respect to a denser medium is 0.5, what is the critical angle?

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Q 17Answer the following questions: [2 M]2 Marks

Define total internal reflection of light.

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Q 18Answer the following questions: [2 M]2 Marks

Define critical angle.

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Q 19Answer the following questions: [2 M]2 Marks

Place a coin at the bottom of a glass jar containing water. Now tilt the jar suitably. When viewed at a suitable angle, the coin appears to be floating. Why?

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Q 20Answer the following questions: [2 M]2 Marks

If the refractive index of a certain material with respect to air is 1.5, what is the refractive index of air with respect to that material?

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Q 21Answer the following questions: [3 M]3 Marks

The speed of light in water and glass is $2.2 \times 10^8 m / s$ and $2 \times 10^8 m / s$ respectively. What is the refractive index of (i) water with respect to glass (ii) glass with respect to water?

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Q 22Answer the following questions: [3 M]3 Marks

The refractive index of water is $4 / 3$ and the speed of light in air is $3 \times 10^8 m / s$. Find the speed of light in water.

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Q 23Answer the following questions: [3 M]3 Marks

Light travels with a velocity $1.5 \times 10^8 m / s$ in a medium. On entering second medium its velocity becomes $0.75 \times 10^8 m / s$. What is the refractive index of the second medium with respect to the first medium? (Practice Activity Sheet -3 )

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Q 24Answer the following questions: [3 M]3 Marks

The velocity of light in a medium is $2 \times 10^8 m / s$. What is the refractive index of the medium with respect to air, if the velocity of light in air is $3 \times 10^8 m / s$ ?

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Q 25Answer the following questions: [3 M]3 Marks

The speed of light in a transparent medium is $2.4 \times 10^8 m / s$. Calculate the absolute refractive index of the medium.

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Q 26Answer the following questions: [5 M]5 Marks

With a neat labelled diagram, describe the experiment to demonstrate dispersion of sunlight (white light) by a prism.

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Q 27Answer the following questions: [5 M]5 Marks

With a neat labelled diagram, explain advanced sunrise and delayed sunset.

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Q 28Answer the following questions: [5 M]5 Marks

What is the correct reason for blinking/flickering of stars? Explain it.
(a) The blasts in the stars.
(b) Absorption of star light by the atmosphere.
(c) Motion of the stars.
(d) Changing refractive index of gases in the atmosphere.

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Q 29Answer the following questions: [5 M]5 Marks

With a neat labelled diagram, explain twinkling of a star. Also explain why a planet does not twinkle.

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Q 30Answer the following questions: [5 M]5 Marks

What is a mirage? With a neat labelled diagram, explain the conditions under which it is seen.

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Q 31Write True or False1 Mark

Wavelength of orange light is greater than that of blue light.

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Q 32Write True or False1 Mark

Wavelength of red light is close to 700 nm.