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Refraction Through A Lens

The document consists of a series of questions related to the properties and behaviors of lenses, including types of lenses, image formation, focal lengths, and magnification. It covers both theoretical concepts and practical applications, such as calculating the power of lenses and determining image characteristics. The questions are designed to test understanding of optics principles and lens behavior.

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jyothsnbhaskar77
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14 views2 pages

Refraction Through A Lens

The document consists of a series of questions related to the properties and behaviors of lenses, including types of lenses, image formation, focal lengths, and magnification. It covers both theoretical concepts and practical applications, such as calculating the power of lenses and determining image characteristics. The questions are designed to test understanding of optics principles and lens behavior.

Uploaded by

jyothsnbhaskar77
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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REFRACTION THROUGH A LENS

1. Which of the following is diverging in nature ?


a. Plane mirror
b. Convex lens
c. Concave lens
d. None of these
2. A ray of light passing through optical centre suffers:
a. Reflection
b. Refraction
c. Total internal reflection
d. None of these
3. A virtual image smaller than the object can be formed by:
a. Convex lens
b. Concave lens
c. Concave mirror
d. Plane mirror
4. If a convex lens is thin its focal length is:
a. Small
b. Large
c. Nothing can be said
d. None of these
5. Express the power of a concave lens of focal length 20cm with its sign.
a. 5D
b. -0.5D
c. -5D
d. 0.5D
6. A concave lens forms the image of an object kept at a distance 20 cm in front of it, at a
distance 10 cm on the side of the object.
a. What is the nature of the image?
b. Find the focal length of the lens.
7. The focal length of a convex lens is 25 cm. At what distance from the optical centre of
the lens an object be placed to obtain a virtual image of twice the size?
8. Where should an object be placed in front of a convex lens of focal length 0.12 m to
obtain a real image of size three times the size of the object, on the screen?
9. An illuminated object lies at a distance 1.0 m from a screen. A convex lens is used to
form the image of object on a screen placed at distance 75 cm from the lens. Find:
a. the focal length of lens
b. the magnification
10. A lens forms the image of an object placed at a distance 15 cm from it, at a distance 60
cm in front of it. Find:
a. the focal length
b. the magnification
c. the nature of image
11. An object is placed at a distance of 20 cm in front of a concave lens of focal length 20
cm. Find:
a. the position of image
b. the magnification of the image
12. The power of a lens is +2.0 D. Find its focal length and state the kind of the lens.
13. Express the power (with sign) of a concave lens of focal length 20 cm.
14. Define the following:
a. Centre of curvature
b. Principal axis
c. Optical centre
d. Power of a lens
15. A converging lens forms the image of an object placed in front of it, beyond 2F2 of the
lens.
a. Where is the object placed?
b. Draw a ray diagram to show the formation of the image
c. State its three characteristics of the image

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