Laws of Refraction

Q.

Refracted angle is always greater than the incidence angle.

1. True

2. False

Q. Why is the angle of emergence equal to the angle of incidence in a rectangular glass slab but not in a triangular glass prism?

Q. In reflection, angle i=angle r, therefore when a ray strikes surface normally angle i=0 and angle r=0. But there is no such rule in refraction(i=r). So, why, when a ray strikes the surface of separation of 2 media normally, it suffers no refraction?

Q. What are the factors on which the lateral displacement of light through a glass slab depends?

1. The thickness of the glass slab
2. The angle of incidence
3. The refractive index of glass
4. The mass of the glass slab

Q.

At the interface of two transparent media, at the point of incidence, the incident ray, the refracted ray and the normal all lie in _____.

1. Same plane

2. Depends on the medium

3. Insufficient data

4. Different plane

Q.

Total Internal Reflection takes place in water only.

1. True

2. False

Q. 17. A beam of light travelling in air enters into a liquid .Its speed reduces by 30%.the refractive index of light with respect to air is

Q. The "Ray" model of light fails to explain the optical phenomena when

1. the light is travelling in any media other than vacuum
2. the wavelength of the light is very small as compared to the dimensions of openings it interacts with
3. the wavelength of the light is comparable to the dimensions of the openings it encounters
4. none of the above.

Q. Define dispersion of light. What are the colors obtained when a white light ray passes through a glass prism?

Q.

Give an expression for Snells Law.

Q. Suppose white light going through a prism is split into its constituent colours and half of them are blocked by a piece of paper. Now, the remaining colours are kept in front of an identical inverted prism. What will happen?

1. The remaining colours combine to give white light.
2. The remaining colours combine to give a different coloured light.
3. The colours get further dispersed.
4. The light goes through unchanged and unhindered.

Q. The light ray $\text{LM}$ is incident from air to honey along the direction of the normal. Complete the ray diagram.

1. 
2. 
3. 
4. 

Q. Assertion :A beam of light rays has been reflected from a rough surface. Reason: Amplitude of incident and reflected rays would be different.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. If the angle of incidence is twice the angle of refraction in a medium of refractive index $\mu$, then the angle of incidence is :

1. $2co{s}^{-1}\mu$
2. $2co{s}^{-1}\frac{\mu }{2}$
3. $2si{n}^{-1}\mu$
4. $2si{n}^{-1}\frac{\mu }{2}$