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A diverging lens of focal length 10 cm is placed 10 cm in front of a plane mirror as shown in the figure. Light from a very far away source falls on the lens. The final image is at a distance

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Important Questions on Ray Optics

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JEE Main
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 32
A symmetric double convex lens is cut into two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4 D, the power of a cut lens will be
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 33
Two concave lenses L1 and L2 are kept in contact with each other. If the space between the two lenses is filled with a material of smaller refractive index, the magnitude of the focal length of the combination
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 34
The convex surface of a thin concavo-convex lens of glass of refractive index 1.5 has radius of curvature 10 cm. The concave surface has a radius of curvature 30 cm. The convex side is silvered and placed on a horizontal surface. Then where should a pin be placed on the optic axis such that its image is formed at the same place?

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JEE Main
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 35
A thin glass (refractive index 1.5) lens has optical power of -5 D in air. Its optical power in a liquid medium with refractive index 1.6 will be
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JEE Main
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 36
A simple microscope has a focal length of 5 cm. The magnification at the least distance of distinct vision is-
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JEE Main
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 37
A Galileo telescope has an objective of focal length 100 cm and magnifying power 50. The distance between the two lenses in normal adjustment will be
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JEE Main
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 38
The objective lens of a telescope has a diameter of 12.2 cm. The angular resolution of the telescope at the wavelength of 500 nm is
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JEE Main
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 39
The magnifying power of a telescope can be increased by