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The formula to find normal shift of an object due to a glass slab is: Normal shift=thickness of slab-thickness of slabrefractive index.

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Important Questions on Light- Reflection and Refraction

EASY
Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
In total internal reflection, when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?
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Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
A ray of light is incident from a denser to a rarer medium. The critical angle for total internal reflection is θiC and Brewster's angle of incidence is θiB, such that sinθiCsinθiB=η=1.28. The relative refractive index of the two media is
EASY
Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
Pick the wrong answer in the context with rainbow.
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Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
The critical angle for light going from medium x to medium y is θ . The speed of light in medium x is vx . The speed of light in medium y is
EASY
Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
An air bubble in a glass slab with refractive index 1.5 (near-normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness (in cm) of the slab is
HARD
Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
A transparent cube of side d, made of a material of refractive index μ2, is immersed in a liquid of refractive index μ1 ( μ1<μ2). A ray is incident on the face AB at an angle θ (shown in the figure). Total internal reflection takes place at the point E on the face BC.

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Then, θ must satisfy
HARD
Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
A point source S is placed at the bottom of a transparent block of height 10 mm and refractive index 2.72. It is immersed in a lower refractive index liquid as shown in the figure. It is found that the light emerging from the block to the liquid forms a circular bright spot of diameter 11.54 mm on the top of the block. The refractive index of the liquid is

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MEDIUM
Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab

The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42°. Complete the path of the ray PQ till it emerges out of the block. Write necessary angles.
 

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MEDIUM
Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
A ray of light incident on a transparent sphere at an angle π4 and refracted at an angle r, emerges from the sphere after suffering one internal reflection. The total angle of deviation of the ray is
EASY
Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab

A ray of light originates from inside a glass slab and is incident on its inner surface at an angle θ as shown,

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In this experiment the location x of the spot where they ray hits the screen is recorded. Which of the following correctly shown the plot of variation of x with the angle θ ?

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MEDIUM
Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
The critical angle of a medium for a specific wavelength, if the medium has relative permittivity 3 and relative permeability 43 for this wavelength, will be:
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Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
A green light is incident from the water to the air - water interface at the critical angle θc. Select the correct statement.
EASY
Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
There is a small source of light at some depth below the surface of water (refractive index =43 ) in a tank of large cross sectional surface area. Neglecting any reflection from the bottom and absorption by water, percentage of light that emerges out of surface is (nearly):
[Use the fact that surface area of a spherical cap of height h and radius of curvature r is 2πrh ]
HARD
Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
A monochromatic light is incident from air on a refracting surface of a prism of angle 75o and refractive index n0=3. The other refracting surface of a prism is coated by a thin film of material of refractive index n as shown in figure. The light suffers total internal reflection at the coated prism surface for an incidence angle of θ≤60o. The value of n2 is_______.

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EASY
Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
Define critical angle.
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Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
If the critical angle for total internal reflection from a medium to vacuum is 45°, then velocity of light in the medium is,
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Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
State one important factor which affects the critical angle of a given medium.
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Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
A diver looking up through the water sees the outside world contained in a circular horizon. The refractive index of water is 4 3 , and the diver's eyes are 15 cm below the surface of the water. Then the radius of the circle is :
EASY
Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
A travelling microscope is focused on an ink dot. When a glass slab (n=1.5) of thickness 9 cm is introduced on the dot, the travelling microscope has to be moved by
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Science>Physics>Light- Reflection and Refraction>Refraction through Glass Slab
A beam of light consisting of red, green and blue colours is incident on a right-angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47 respectively.

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The prism will: