Advertisements
Advertisements
Question
The focal length of a lens is positive. In this case, state the kind of lens.
Solution
The positive focal length of a lens indicates that it is a convex lens.
APPEARS IN
RELATED QUESTIONS
A ray of light travelling in water emerges into air. Draw a ray-diagram indicating the change in its path.
Define the term principal axis of a lens.
Where is the image formed?
A convex lens has a divergent action and a concave lens has a convergent action.
Yesh find out F1 and F2 of symmetric convex lens experimentally then which conclusion is true.
A pin 2 cm long is placed 12 cm away from a convex lens at right angles to the principal axis. If the focal length of the lens is 20 cm, by scale drawing find the size of the image and its magnification.
An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length 15.0 cm.
(i) At what distance from the mirror should a screen be placed in order to obtain a sharp image?
(ii) Find the size of the image.
(iii) Draw a ray diagram to show the formation of the image in this case.
Can a normal convex lens behave like a concave lens and vice-versa?
