When a ray of light falls on a given plate at an angle of incidence \(60^{\circ}\), the reflected and refracted rays are found to be normal to each other. The refractive index of the material of the plate is:

1. \(\frac{\sqrt{3}}{2} \) 2. \(1.5 \)
3. \(1.732 \) 4. \( 2\)
Subtopic:  Refraction at Plane Surface |
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A medium shows relation between i and r as shown. If the speed of light in the medium is nc then the value of n is:

                  

1. 1.5

2. 2

3. 2–1

4. 3–1/2

Subtopic:  Refraction at Plane Surface |
 76%
From NCERT
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In the figure shown the angle made by the light ray with the normal in the medium of refractive index 2 is:
                 
1. \(30^{\circ}\)

2. \(60^{\circ}\)

3. \(90^{\circ}\)

4. None of these

Subtopic:  Refraction at Plane Surface |
 73%
From NCERT
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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:

1. 8 2. 10
3. 12 4. 16
Subtopic:  Refraction at Plane Surface |
 74%
From NCERT
NEET - 2016
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A plane mirror is placed at the bottom of a fish tank filled with water of refractive index 43. The fish is at a height 10 cm above the plane mirror. An observer O is vertically above the fish outside water. The apparent distance between the fish and its image is:
                         

1. 15 cm

2. 30 cm

3. 35 cm

4. 45 cm

Subtopic:  Refraction at Plane Surface |
 63%
From NCERT
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Two slabs P & Q of transparent materials have a thickness in the ratio 2 : 5. If a ray of light takes the same amount of time to move from A to B and B to C, then the refractive index of Q with respect to P will be:

   

1. 0.4 

2. 2.5

3. 1.4

4. 1.85

Subtopic:  Refraction at Plane Surface |
 63%
From NCERT
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