MEDIUM
12th West Bengal Board
IMPORTANT
Earn 100
The lower half of a convex lens is made of material of refractive index and the upper half has refractive index . If a point source of light is placed on the principal axis which kind of image is formed by it?
Important Questions on Refraction at Spherical Surfaces and Spherical Lens
MEDIUM
12th West Bengal Board
IMPORTANT
A convex lens of refractive index is immersed in a medium of refractive index . How would it behave of and
MEDIUM
12th West Bengal Board
IMPORTANT
A convex lens is hold in water. What would be the change in the focal length?
EASY
12th West Bengal Board
IMPORTANT
A convex lens forms the image of the sun at a distance of . Where will the image be formed, if a lens of the same power but of double the aperture is used?
MEDIUM
12th West Bengal Board
IMPORTANT
A convex lens forms the image of the sun at a distance of . Where will be the image when another lens of same aperture but double the power is used?
MEDIUM
12th West Bengal Board
IMPORTANT
How does the focal length of a lens change when red light is replaced by blue light?
MEDIUM
12th West Bengal Board
IMPORTANT
Where should an object be placed from a convex lens to form an image of the same size? Can it happen in the case of a concave lens?
HARD
12th West Bengal Board
IMPORTANT
The image of a candle is formed by a convex lens on a screen. The lower half of the lens is painted black to make it comply opaque. Draw ray diagram to show, the image formation. How this image be different from one obtained, when the lens is not painted black.
MEDIUM
12th West Bengal Board
IMPORTANT
Two thin lenses of power and are in contact. What is the focal length of the combination?
