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प्रश्न
An object is placed in front of a converging lens. Obtain the conditions under which the magnification produced by the lens is
- negative and
- positive.
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उत्तर
- Magnification is negative for the real image formed by a convex lens.
- Magnification is positive for the virtual image formed by a convex lens.
संबंधित प्रश्न
A student uses a lens of focal length 40 cm and another of –20 cm. Write the nature and power of each lens
Name the physical quantity whose unit is dioptre.
The power of a lens is + 0.2 D. Calculate its focal length.
Two lenses A and B have focal lengths of +20 cm and, −10 cm, respectively.
(a) What is the nature of lens A and lens B?
(b) What is the power of lens A and lens B?
(c) What is the power of combination if lenses A and B are held close together?
Express the power (with sign) of a concave lens of focal length 20 cm.
According to Rayleigh’s scattering law, the amount of scattering of light is inversely proportional to the fourth power of its ______.
The focal length of a double convex lens is equal to the radius of curvature of either surface. What is the refractive index of its material?
The deviation of the incident light rays produced by a lens on refraction through it is a measure of its:
A convex lens is a converging lens whose focal length and power are both:
When a lens is placed in a liquid, the total power of the lens is:
