EASY

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With respect to air the refractive index of kerosene is $1.44$ and that of diamond is $2.42$ . Calculate index of diamond with respect to kerosene.

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Important Questions on Ray Optics and Optical Instruments

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Physics>Optics>Ray Optics and Optical Instruments>Refraction at Plane Surfaces

What is lateral shift with respect to optics?

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Physics>Optics>Ray Optics and Optical Instruments>Refraction at Plane Surfaces

To a fish under water, viewing obliquely a fisher-man standing on the bank of a lake, does appear as

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Physics>Optics>Ray Optics and Optical Instruments>Refraction at Plane Surfaces

Due to atmospheric refraction effects, the day becomes longer by

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Physics>Optics>Ray Optics and Optical Instruments>Refraction at Plane Surfaces

A glass tumbler having inner depth of

17.5 cm

is kept on a table. A student starts pouring water

(μ = \frac{4}{3})

into it while looking at the surface of water from the above. When he feels that the tumbler is half filled, he stops pouring water. Up to what height, the tumbler is actually filled ?

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Physics>Optics>Ray Optics and Optical Instruments>Refraction at Plane Surfaces

A diver, $30 m$ below water surface is trying to shine a torch light towards the point O which is horizontally $30 m$ away. The amount and direction in which diver has to swim (in the figure) so that the light can not travel outside the surface of water is (Refractive index of water $= \frac{4}{3}$ )

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Physics>Optics>Ray Optics and Optical Instruments>Refraction at Plane Surfaces

In refraction, light waves are bent on passing from one medium to second medium because, in the second medium.

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Physics>Optics>Ray Optics and Optical Instruments>Refraction at Plane Surfaces

A monochromatic beam of light passing through water (refractive index

= 4 / 3

) has wavelength

5400 Å .

When it is refracted in glass (refractive index

= 3 / 2

) its wavelength will be

EASY

Physics>Optics>Ray Optics and Optical Instruments>Refraction at Plane Surfaces

If the refractive indices of water and glass are

\frac{4}{3}

and

\frac{3}{2}

respectively. The refractive index of glass with respect to water is

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Physics>Optics>Ray Optics and Optical Instruments>Refraction at Plane Surfaces

A glass slab of thickness

4 cm

contains the same number of waves as in

x cm

of water column when both are traversed by the same monochromatic light. If the refractive indices of glass and water for that light are

\frac{5}{3}

and

\frac{4}{3}

respectively, the value of

x

will be

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Physics>Optics>Ray Optics and Optical Instruments>Refraction at Plane Surfaces

When a plane electromagnetic wave enters a glass slab, then which of the following will not change?

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Physics>Optics>Ray Optics and Optical Instruments>Refraction at Plane Surfaces

Light of wavelength

300 nm

in medium

A

enters into medium

B

through a plane surface. If the frequency of light is

5 \times 10^{14} Hz

and the ratio of speed in medium

A

to that is medium

B

\frac{4}{5}

, the absolute refractive index of medium

B

is,

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Physics>Optics>Ray Optics and Optical Instruments>Refraction at Plane Surfaces

Electromagnetic waves emanating from a point $A$ (in air) are incident on a rectangular block of material $M$ and emerge from the other side as shown below. The angles $i$ and $r$ are angles of incidence and refraction when the wave travels from air to the medium. Such paths for the rays are possible,

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