EASY
12th Bihar Board
IMPORTANT
Earn 100

Cylindrical lenses are used to correct the eye defect called-
(a)myopia
(b)hypermetropia
(c)astigmatism
(d)presbyopia

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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 and will be-

MEDIUM
12th Bihar Board
IMPORTANT
Two thin convex lens of power and diopter are placed co-axially at a distance . Find the focal length of the combination.

EASY
12th Bihar Board
IMPORTANT
Differentiate between primary and secondary rainbow.

EASY
12th Bihar Board
IMPORTANT
Velocity of light in a medium is and velocity of light in medium is . If refractive index of medium is and refractive index is , then what will be value of

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 :
