MEDIUM
10th CBSE
IMPORTANT
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A divergent lens has focal length of 20 cm. At what distance should an object from the lens be placed so that an image is formed 10 cm away from the lens? What is the magnification produced by the lens?

Important Questions on Light : Reflection and Refraction

MEDIUM
10th CBSE
IMPORTANT
ESSENTIALS OF PHYSICS CLASS X>Chapter 1 - Light : Reflection and Refraction>Practice Problems-III>Q 7
The image of an object formed by a convex lens is of the same size as that of the object. If the image is formed at a distance of 50 cm from the lens, at what distance from the lens is the object placed? Find the focal length and power of the lens used.
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF PHYSICS CLASS X>Chapter 1 - Light : Reflection and Refraction>Practice Problems-III>Q 8
What is the power of a convex lens of focal length 40 cm?
MEDIUM
10th CBSE
IMPORTANT
ESSENTIALS OF PHYSICS CLASS X>Chapter 1 - Light : Reflection and Refraction>Practice Problems-III>Q 9
Two thin converging lenses of focal lengths 0.15 m and 0.30 m are held in contact with each other. Calculate the power and focal lengths of the combination.
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF PHYSICS CLASS X>Chapter 1 - Light : Reflection and Refraction>Assignment-3>Q 1
Define power of a lens and write its SI units.
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF PHYSICS CLASS X>Chapter 1 - Light : Reflection and Refraction>Assignment-3>Q 2
What is the nature of a lens having focal length +20 cm?
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF PHYSICS CLASS X>Chapter 1 - Light : Reflection and Refraction>Assignment-3>Q 3
Write relation between u,v and f for lens.
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF PHYSICS CLASS X>Chapter 1 - Light : Reflection and Refraction>Assignment-3>Q 4
A lens has a power of -6D. It is a concave or a convex lens.
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF PHYSICS CLASS X>Chapter 1 - Light : Reflection and Refraction>Assignment-3>Q 5
Write the relation between height of the object (h) , height of image(h'), object distance (u) and image distance (v) for a lens.