Spherical Lenses
Important Questions on Spherical Lenses
The distance between the optical centre and the principal focus of a lens is called its _____ .
The image formed by a convex lens is inverted, magnified and real, when an object is kept between the lens and the focus.
A convex and a concave lens are given to you to read a dictionary. Which of the two lenses would you use?
With the help of a ray diagram, explain the Focal length of a convex lens.
With the help of a ray diagram, explain the Optical centre of a convex lens.
With the help of a ray diagram, explain the Focus of convex lens.
Nitika’s grandmother is not able to see distant objects properly. Nitika takes her to the nearby eye specialist. What value can you learn from Nitika?
Nitika’s grandmother is not able to see distant objects properly. Nitika takes her to the nearby eye specialist. Which type of lens would be suggested by the doctor for Nitika’s grandmother?
Which kind of lens can form an erect image smaller that the object.
Which kind of lens can form an inverted image smaller that the object.
Define the principal focus of a concave lens
Write the differences between a convex and a concave lens.
The black paper after a few minutes _____.
A man sees a magnified image of a closely kept object by holding a simple ‘clear glass’ device in his hand. The device is likely to be a _____.
Name the piece of transparent materials which has one or two spherical surfaces.
