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A beam of light composed of red and green rays is incident obliquely at a point on the face of rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from

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Important Questions on Ray Optics

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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 196
A short sighted person can read a book clearly at a distance of 10 cm from the eyes. The lenses required to read the book kept at 60 cm are
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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 197
A person can not see the objects clearly placed at a distance more than 40 cm. He is advised to use a lens of power
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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 198
A person can see clearly only up to a distance of 25 cm. He wants to read a book placed at a distance of 50 cm. What kind of lens does he require for his spectacles, and what must be its power?
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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 199
Astigmatism (for a human eye) can be removed by using
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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 201
A person cannot see distinctly at a distance of less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm.
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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 202
A person who can see things most clearly at a distance of 10 cm. Requires spectacles to enable him to see clearly things at a distance of 30 cm. What should be the focal length of the spectacles?
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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 203
The power of lens used by a short-sighted person is - 20 D. Find the maximum distance of an object which he can see without spectacles.
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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 204
A simple microscope has a focal length of 5 cm. The magnification at the least distance of distinct vision is-