Physics>Optics>Optics>Refraction

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The formula to find apparent shift of an object is, $apparent shift = real depth (1 - \frac{1}{refractive index})$ .

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Important Questions on Optics

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Physics>Optics>Optics>Refraction

A ray of light wavelength

λ_{0}

and frequency v₀ enters a glass slab of refractive index

μ

from air. Then,

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Physics>Optics>Optics>Refraction

A light wave is incident normally on a glass slab of refractive index

1.5 .

If

4 %

of light gets reflected and the amplitude of the electric field of the incident light is

30 \frac{V}{m},

then the amplitude of the electric field for the wave propagating in the glass medium will be:

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Physics>Optics>Optics>Refraction

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

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Physics>Optics>Optics>Refraction

Blue light travelling in a vacuum has a wavelength of

450 nm .

It enters a medium whose refractive index is

1.5 .

What is its frequency in the medium?
(Speed of light in vacuum

= 3 \times 10^{8} m s^{- 1}

)

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Physics>Optics>Optics>Refraction

Choose the wrong statement.

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Physics>Optics>Optics>Refraction

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

is

\frac{4}{5}

, the absolute refractive index of medium

B

is,

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Physics>Optics>Optics>Refraction

Light of wavelength

5000 \overset{o}{A}

in air has wavelength in glass

(μ = 1.5)

equal to:

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Physics>Optics>Optics>Refraction

A pond appears to be

2.7 m

deep. If the refractive index of water is

\frac{4}{3}

, find the actual depth of the pond.

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Physics>Optics>Optics>Refraction

Frosted glass is widely used for translucent windows. The region, where a transparent adhesive tape is stuck over the frosted glass becomes transparent. The most reasonable explanation for this is

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Physics>Optics>Optics>Refraction

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

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Physics>Optics>Optics>Refraction

Which of the following graphs shows appropriate variation of refractive index

μ

with wavelength

λ

?

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Physics>Optics>Optics>Refraction

When light enters glass from vacuum, then the wavelength of light

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Physics>Optics>Optics>Refraction

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 the image

I

. The image

I

will move

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Physics>Optics>Optics>Refraction

The wavelength of a light coming from a sodium source is

645 nm

. What will be its wavelength in water, if the refractive index of water is

1.33 ?

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Physics>Optics>Optics>Refraction

If the difference in the velocities of light in glass and water is

0.25 \times 10^{8} m / s

, calculate the velocity of light in air. Given that refractive index of glass and water with respect to air are

1.5

and

\frac{4}{3}

respectively.

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Physics>Optics>Optics>Refraction

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>Optics>Refraction

The refractive indices of water and diamond are $\frac{4}{3}$ and $2.42$ respectively. Find the speed of light in water and diamond. $(c = 3 \times 10^{8} m s^{- 1})$

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Physics>Optics>Optics>Refraction

Which one of the following physical quantities does not have unit?

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Physics>Optics>Optics>Refraction

A vessel of depth

2 h

is half filled with a liquid of refractive index

2 \sqrt{2}

and the upper half with another liquid of refractive index

\sqrt{2}

. The liquids are immiscible. The apparent depth of the inner surface of the bottom of the vessel will be

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Physics>Optics>Optics>Refraction

When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness

6 cm

is same as in water column of height

7 cm

. If refractive index of glass is

1.5

then refractive index of water is