(A) The power of a lens is given by the formula $P = \frac{1}{f}$,where $f$ is the focal length in meters.Given power $P = -4.0 \text{ D}$.Since the p

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Concave lens of focal length $-25.0 \text{ cm}$

(A) The power of a lens is given by the formula $P = \frac{1}{f}$,where $f$ is the focal length in meters.Given power $P = -4.0 \text{ D}$.Since the power is negative,the lens is a concave lens.Using the formula $f = \frac{1}{P}$,we get:$f = \frac{1}{-4.0} \text{ m} = -0.25 \text{ m}$.Converting meters to centimeters: $f = -0.25 \times 100 \text{ cm} = -25.0 \text{ cm}$.Therefore,it is a concave lens with a focal length of $-25.0 \text{ cm}$.

Class 12 Physics Ray Optics and Optical Instruments Refraction by Lenses

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$A$ lens has a power of $-4.0 \text{ Diopter}$. This means . . . . . . .

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A
Concave lens of focal length $-25.0 \text{ cm}$
B
Concave lens of focal length $-0.25 \text{ cm}$
C
Concave lens of focal length $+0.25 \text{ cm}$
D
Concave lens of focal length $+25.0 \text{ cm}$

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Ray Optics and Optical Instruments

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Refraction by Lenses

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$A$ lens of refractive index $n$ is placed in a liquid of refractive index $n'$. If the focal length of the lens in air is $f$,what will be its focal length in the liquid?

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Define magnification for a lens and derive its expression.

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The thickness at the centre of a plano-convex lens is $3 \, mm$ and the diameter is $6 \, cm$. If the speed of light in the material of the lens is $2 \times 10^{8} \, m/s$,the focal length of the lens is ............ $cm$.

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$A$ beam of light converges at a point $P$. Now a lens is placed in the path of the convergent beam $12 \, cm$ from $P$. At what point does the beam converge if the lens is a convex lens of focal length $20 \, cm$ (in $, cm$)?

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$A$ lens has a power of $-4.0 \text{ Diopter}$. This means . . . . . . .

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$A$ lens of refractive index $n$ is placed in a liquid of refractive index $n'$. If the focal length of the lens in air is $f$,what will be its focal length in the liquid?

$A$ convex lens produces a real image $m$ times the size of the object. What will be the distance of the object from the lens?

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The thickness at the centre of a plano-convex lens is $3 \, mm$ and the diameter is $6 \, cm$. If the speed of light in the material of the lens is $2 \times 10^{8} \, m/s$,the focal length of the lens is ............ $cm$.

$A$ beam of light converges at a point $P$. Now a lens is placed in the path of the convergent beam $12 \, cm$ from $P$. At what point does the beam converge if the lens is a convex lens of focal length $20 \, cm$ (in $, cm$)?

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