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A linear object AB is placed along the axis of a concave mirror. The object is moving towards the mirror with speed V. The speed of the image of the point A is 4V and the speed of the image of point B is also 4V. If the centre of the line AB is at a distance L from the mirror, then the length of the object AB will be 

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Important Questions on Ray Optics

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NEET
IMPORTANT
Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 3>Q 8
An astronomical telescope has a large aperture to
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NEET
IMPORTANT
Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 3>Q 9
If in compound microscope m1 and m2 are the linear magnification of the objective lens and eye lens, respectively, then the magnifying power of the compound microscope will be
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IMPORTANT
Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 3>Q 10
A long-sighted person has a minimum distance of distinct vision of 50 cm. He wants to reduce it to 25 cm. He should use a
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Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 3>Q 11
A point object is placed at a distance of 30 cm from a convex mirror of focal length 30 cm. The image will form at
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Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 3>Q 12
A point object is placed at a distance of 10 cm and its real image is formed at a distance of 20 cm from a concave mirror. If the object is moved by 0.1 cm towards the mirror, the image will shift by about
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Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 3>Q 13
A thin rod of length f3 lies along the axis of a concave mirror of focal length f. One end of its magnified image touches an end of the rod. The length of the image is
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Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 3>Q 14
An infinitely long rod lies along the axis of a concave mirror of focal length f. The near end of the rod is at a distance u>f from the mirror. Its image will have a length
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Physics Crash Course NEET>Chapter 17 - Ray Optics>Level 3>Q 15
A short linear object of length b lies along the axis of a concave mirror of focal length f at a distance u from the pole of the mirror, what is the size of image?