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10th CBSE
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What is the unit of power of lens? Define the unit of power of a lens.

Important Questions on Refraction of Light

EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 5 - Refraction of Light>Long Answer Type Questions>Q 29
A combination of lenses for a camera contains two converging lenses of focal lengths 20 cm and 40 cm and a diverging lens of focal length 50 cm. Find the power and focal length of the combination.
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 5 - Refraction of Light>Long Answer Type Questions>Q 30
Two lenses A and B have power of (i) +2 D and (ii) -4 D respectively. What is the nature and focal length of each lens?
MEDIUM
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 5 - Refraction of Light>Long Answer Type Questions>Q 30
An object is placed at a distance of 100 cm from each of the  lenses A and B having power +2 D and -4 D respectively. Calculate (i) image distance and (ii) magnification, in each of the two cases.
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 5 - Refraction of Light>Multiple Choice Questions (MCQs)>Q 31
The focal length of four convex lenses P, Q, R and S are 20 cm, 15 cm, 5 cm and 10 cm, respectively. The lens having greatest power is:
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 5 - Refraction of Light>Multiple Choice Questions (MCQs)>Q 32
A converging lens has a focal length of 50 cm. The power of this lens will be:
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10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 5 - Refraction of Light>Multiple Choice Questions (MCQs)>Q 33
A diverging lens has a focal length of 0.10 m. The power of this lens will be:
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10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 5 - Refraction of Light>Multiple Choice Questions (MCQs)>Q 34
The power of a lens is +2.0 D. Its focal length should be:
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 5 - Refraction of Light>Multiple Choice Questions (MCQs)>Q 35
If a spherical lens has a power of, -0.25 D, the focal length of this lens will be: