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प्रश्न
Explain the following term related to spherical lenses: focal length
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उत्तर
Focal Length:-
The focal length of a lens is the distance between optical centre and principal focus of the lens.
संबंधित प्रश्न
Give one use each of a concave and a convex mirror.
What type of image is formed:
on a cinema screen?
A 2.0 cm tall object is placed 40 cm from a diverging lens of focal length 15 cm. Find the position and size of the image.
Write true or false
A virtual image formed by a spherical mirror is always erect and situated behind the mirror.
Complete the following diagrams in Figure by drawing the reflected rays for the incident rays 1 and 2.
Name the kind of mirror used to obtain :
A real and enlarged image
Name the kind of mirror used to obtain:
A real and diminished image.
Draw a ray diagram to show the formation of image of an object kept in front of a convex mirror. State three characteristics of the image.
What is the relation between focal length and radius of curvature of a concave mirror?
An object is placed in front of a concave mirror as shown in the following figure. By scale drawing, find the nature of the image. Given f = 10 cm, v = 30 cm.
