Refraction of Light at Curved Surfaces
Telangana Board · Class 10 · Physical Sciences
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Quick Quiz: Refraction of Light at Curved Surfaces
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What is the center of the sphere of which a curved surface is a part called?
Which type of lens is thicker at the center than at the edges?
What is the lens formula?
When parallel rays of light fall on a convex lens, they:
Sample Questions
Which of the following rays pass through a lens undeviated?
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Ray passing along the principal axis, Ray passing through the optic center
Only rays passing along the principal axis and through the optic center pass undeviated. Parallel rays converge at focus, and rays through focus become parallel.
The magnification formula for lenses is:
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m = v/u
Magnification m = v/u = height of image/height of object. Here v is image distance and u is object distance from the lens.
For a concave lens, the focal length is:
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Always negative
For a concave (diverging) lens, the focal length is always negative according to the sign convention, as the focus is on the same side as the object.
When an object is placed between the focal point and optical center of a convex lens, the image formed is:
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Virtual, Erect, Magnified
When object is between focal point and optical center of convex lens, image is virtual (cannot be captured on screen), erect (upright), and magnified (larger than object).
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