Test on Ray Optics and Optical Instruments-3

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Question 1

A light ray is incident perpendicularly to one face of a 90^o prism and is totally internally reflected at the glass-air interface. If the angle of reflexion is 45^o, we conclude that the refractive index n

• An >
• Bn >
• Cn <
• Dn <

Question 2

A given ray of light suffers minimum deviation in an equilateral prism p. Additional prisms Q and R of identical shape and material are now added to P as shown in the figure. The ray will suffer

• AGreater deviation
• BSame deviation
• CNo deviation
• DTotal

Question 3

The refractive index of the material of a prism is and its prism angle is 30 °. One of its refracting faces is polished. The incident beam of light will return back for the angle of incidence

• A60 °
• B45 °
• C30 °
• D0 °

Question 4

What is the refractive index of a prism whose angle A = 60^o and angle of minimum deviation sm = 30^o?

• A
• B
• C1
• D

Question 5

A ray incident at 15^o on one refracting surface of a prism of angle 60^o, suffers a deviation of 55^o. What is the angle of emergence

• A95^o
• B45^o
• C30^o
• DNone of these

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