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A student measures the focal length of a convex lens by keeping an object pin at a distance u from the lens and measuring the distance v of the image pin. The graph between v versus u plotted will look like

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Important Questions on Ray Optics

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Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 2>Q 72
When two positive thin lenses are kept in contact, the focal length of the combination is
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Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 2>Q 73
Focal length of a convex lens is 20 cm and its refractive index is 1.5. It produces an erect, enlarged image if the distance from the object of the lens is
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Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 2>Q 74
A transparent plastic bag filled with air forms a concave lens. Now, if this bag is completely immersed in water, then it behaves as
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Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 2>Q 75
A beam of parallel rays is brought to focus by a plano-convex lens. Then, a concave lens of the same focal length is joined to the first lens. The effect of this is
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Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 2>Q 76
A convex lens is immersed in a liquid, whose refractive index is equal to the refractive index of the material of the lens. Then its focal length will
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Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 2>Q 77
A total internal reflection occurs when:
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Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 2>Q 78
The angle of incidence corresponding to which the angle of refraction is a right angle is called _______.
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Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 2>Q 79
If refractive index of glass is 1.50 and of water is 1.33, then critical angle is: