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Physics -- Optics
1.
P is a point on the axis of a concave mirror. The image of P, formed by the mirror, coincides with P. A rectangular glass slab of thickness t and refractive index μ is now introduced between P
and the mirror. For the image of P to coincide with P again, the mirror must be moved
- A.towards P by (μ - 1)t
- B.away from P by (μ - 1)t
- C.towards P by t(1 - 1/μ)
- D.away from P by t(1 - 1/μ)
- Answer
- Report
Answer : [D]
2.
A converging lens forms a real image I on its optic axis. A rectangular glass slab of refractive index μ and thickness t is introduced between the lens and I. I will move
- A.away from the lens by t(μ - 1)
- B.towards the lens by t(μ - 1)
- C.away from the lens by t(1 - 1/μ)
- D.towards the lens by t(1 - 1/μ)
- Answer
- Report
Answer : [C]
3.
A ray of light incident on a slab of transparent material is partly
reflected from the surface and partly refracted into the slab. The
reflected and refracted rays are mutually perpendicular. The
incident ray makes an angle i with the normal to the slab. The
refractive index of the slab is
- A.tan-1(i)
- B.cot-1(i)
- C.sin-1(i)
- D.cos-1(i)
- Answer
- Report
Answer : [A]
4.
A ray of light travels from an optically denser to rarer medium. The critical angle for the two media is c. The maximum possible deviation of the ray will be
- A.π - c
- B.π - 2c
- C.2c
- D.π/2 + c
- Answer
- Report
Answer : [B]
5.
The light reflected by a plane mirror may form a real image,
- A.if the rays incident on the mirror are converging
- B.if the rays incident on the mirror are diverging
- C.if the object is placed very close to the mirror
- D.under no circumstances
- Answer
- Report
Answer : [A]
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