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The focal length of a lens depends upon

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Important Questions on Ray Optics

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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 283
A convex lens of focal length f produces a real image 3 times as that of size of the object, the distance between the object and the lens is
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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 284
When an object is kept in front of a convex lens, the distance between it and the real image is 54 cm. If the magnification produced is 2, the focal length of the lens is
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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 286
A plano-convex lens has focal length of 20 cm. The radius of curvature of its spherical surface is μgn=1.5
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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 287
A concave lens of focal length f produces an image 14 of the size of the object. The distance of the object from the lens is
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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 288
A concave lens has radii of curvatures of 20 cm and 30 cm, respectively. If the refractive index of the material of lens is 1.6, its focal length is given by,
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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 289
The radius of curvature of each surface of a biconcave lens made up of glass of refractive index 1.5 is 30 cm. The focal length of the lens is
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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 294
Spherical aberration in a lens:
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Physics Crash Course MHT-CET>Chapter 19 - Ray Optics>Exercise 1>Q 296
A convex lens has mean focal length of 20 cm. The dispersive power of the material of the lens is 0.02. The longitudinal chromatic aberration for an object at infinity is