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12th ICSE
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A lens is made of two different materials of refractive indices n1 and n2, 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)?

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Important Questions on Refraction of Light at Spherical Surfaces : Lenses

EASY
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 8
How does the focal length of a lens depend on the wavelength of incident light? Of a mirror?
EASY
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 9
What are the two focal length of a lens? Are they equal?
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12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 10
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?
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12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 11
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?
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12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 12
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?
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12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 13
Can a convex (converging) lens behave as a concave (diverging) lens in some situation? Give example.
EASY
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 14
A convex lens forms the image of the sun at a distance of 10 cm. Where will the image be formed, if a lens of the same power but of double the aperture is used?
EASY
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 3 - Refraction of Light at Spherical Surfaces : Lenses>QUESTIONS>Q 14
A convex lens forms the image of the sun at a distance of 10 cm. Where will the image be formed, if a lens of the same aperture but of double the power is used?