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Question
State the condition for the following a lens has both its focal lengths equal .
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Solution
If a lens has both its focal length equal medium is same on either side of lens.
RELATED QUESTIONS
Define the power of a lens.
Find the power of a concave lens of focal length 2m.
Which of the two has a greater power: a lens of short focal length or a lens of large focal length?
A lens has a focal length of, −10 cm. What is the power of the lens and what is its nature?
An object of height 4.25 mm is placed at a distance of 10 cm from a convex lens of power +5D. Find (i) the focal length of the lens, and (ii) the size of the image.
The power of a lens is + 1.0 D is :
Define power of a lens. Write its units. Deduce the relation `1/f =1/f_1 +1/f_2`for two thin lenses kept in contact coaxially.
A normal eye is not able to see objects closer than 25 cm because
The power of lens depends on the focal length of the lens
Assertion and reasoning type
- Assertion: Myopia is due to the increase in the converging power of eye lens.
- Reason: Myopia can be corrected with the help of concave lens.
