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A rectangular metal tank filled with a certain liquid is as shown in the figure. The observer, whose eye is in level with the top of the tank can just see the corner E of the tank. Therefore, the minimum refractive index of the liquid is

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Important Questions on Ray Optics

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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 97
A point source of light is viewed through a plate of glass of thickness t and of refractive index 1.5. The source appears 
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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 98
A ray of monochromatic light is incident on one refracting face of a prism of refracting angle 75°. It passes through the prism and is incident on the other face at the critical angle. If the refractive index of the material of the prism is 2, the angle of incidence on the first face of the prism is,
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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 99
A prism having a refractive index 2 and refracting angle 30º, has one of the refracting surfaces polished. A beam of light incident on the other refracting surface will retrace its path if the angle of incidence is:
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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 100
A ray is incident at an angle of incidence i on one surface of a prism of small angle A and emerges normally from opposite surface. If the refractive index of the material of prism is μ, the angle of incidence i is nearly equal to
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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 101
A prism of the refractive index 2 has a refracting angle 60º. In order that a ray suffers minimum deviation it should be incident at an angle:
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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 102
The maximum refractive index of a material, of a prism of apex angle 90º, for which light may be transmitted is:
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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 103

A prism having an apex angle of 4° and refractive index of 1.50 is located in front of a vertical plane mirror as shown in the figure. A horizontal ray of light is incident on the prism. The total angle through which the ray is deviated is: 

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Alpha Question Bank for Engineering: Physics>Chapter 30 - Ray Optics>Exercise - 1>Q 104
There is a small black dot at the centre C of a solid glass sphere of refractive index μ. When seen from outside, the dot will appear to be located: