EASY
12th Bihar Board
IMPORTANT
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Cylindrical lenses are used to correct the eye defect called-

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Important Questions on Ray Optics and Optical Instruments

EASY
12th Bihar Board
IMPORTANT
Equivalent focal length of two lenses in contact having power -15 D and +5 D will be-
MEDIUM
12th Bihar Board
IMPORTANT
Two thin convex lens of power +5 and +4 diopter are placed co-axially at a distance 10 cm. Find the focal length of the combination.
EASY
12th Bihar Board
IMPORTANT
Differentiate between primary and secondary rainbow.
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12th Bihar Board
IMPORTANT
Velocity of light in a medium A is v and velocity of light in medium B is 2v. If refractive index of medium A is μA and refractive index is μB, then what will be value of μAμB
HARD
12th Bihar Board
IMPORTANT
With neat diagram describe the construction and working of an astronomical telescope and its magnifying power.
HARD
12th Bihar Board
IMPORTANT
What is dispersive power? Find the necessary conditions for obtaining deviation without dispersion by two thin prisms.
EASY
12th Bihar Board
IMPORTANT
The lens which is used to cure short sightedness is :
EASY
12th Bihar Board
IMPORTANT
The refractive index of diamond is about :