MEDIUM
12th West Bengal Board
IMPORTANT
Earn 100
An object is held at the principal focus of a concave lens of focal length . Where is the image formed?
Important Questions on Refraction at Spherical Surfaces and Spherical Lens
MEDIUM
12th West Bengal Board
IMPORTANT
How would a biconvex lens appear when placed in a liquid having the same refractive index as that of the lens?
MEDIUM
12th West Bengal Board
IMPORTANT
The lower half of a convex lens is painted completely dark. What happens to the image of sphere formed by the lens on the wall?
MEDIUM
12th West Bengal Board
IMPORTANT
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?
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?
