EASY
12th ICSE
IMPORTANT
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On what factors does the focal length of a lens depend?
Important Questions on Refraction of Light at Spherical Surfaces : Lenses
MEDIUM
12th ICSE
IMPORTANT
A lens is made of two different materials of refractive indices and , as shown. A point object is placed on the principal axis. How many images of the object will be formed by the lens (neglecting spherical and chromatic aberration)?
EASY
12th ICSE
IMPORTANT
How does the focal length of a lens depend on the wavelength of incident light? Of a mirror?
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12th ICSE
IMPORTANT
What are the two focal length of a lens? Are they equal?
MEDIUM
12th ICSE
IMPORTANT
The image of a candle is formed by a convex lens on a screen. If the lower half of the lens is painted black to make it completely opaque, will still the full-size image of the candle be obtained?
MEDIUM
12th ICSE
IMPORTANT
What will be the effect on focal length and nature of a lens when immersed in a liquid whose refractive index is less than that of the material of the lens?
MEDIUM
12th ICSE
IMPORTANT
A concave mirror and a concave lens are held in water. What changes, if any, do you expect in their focal lengths as compared to their values in air?
MEDIUM
12th ICSE
IMPORTANT
Can a convex (converging) lens behave as a concave (diverging) lens in some situation? Give example.
EASY
12th ICSE
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?
