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प्रश्न
State power of a lens S.I. unit.
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उत्तर
The S.I. unit of power is diopter (D).
संबंधित प्रश्न
Define the power of a lens.
Consider two statements A and B given below:
A: real image is always inverted
B: virtual image is always erect
Out of these two statements:
The focal length of a convex lens is 25 cm. What is its power?
The power of a lens is + 0.2 D. Calculate its focal length.
The power of a combination of two lenses X and Y is 5 D. If the focal length of lens X be 15 cm :
(a) calculate the focal length of lens Y.
(b) state the nature of lens Y.
What is the unit of power of a lens? Define the unit of power of a lens.
Define the term focal length of a lens.
State the condition for the following a ray passes undeviated through the lens .
Consider three converging lenses L1, L2 and L3 having identical geometrical construction. The index of refraction of L1 and L2 are \[\mu_1 \text{ and } \mu_2\] respectively. The upper half of the lens L3 has a refractive index \[\mu_1\] and the lower half has \[\mu_2\] following figure . A point object O is imaged at O1 by the lens L1 and at O2 by the lens L2placed in same position. If L3 is placed at the same place,
(a) there will be an image at O1
(b) there will be an image at O2.
(c) the only image will form somewhere between O1 and O2
(d) the only image will form away from O2.
The power of the magnifying glass depends on the distance of the magnifying glass from object.
