Advertisements
Advertisements
Question
The erect image formed by a concave mirror is of size double the size of object. How are u and v related?
Advertisements
Solution
Magnification is
m = `"I"/"O" = 20/"O" = 2`
∵ m = `-"v"/"u"`
∴ `-"v"/"u"` = 2
∴ v = -2u
But , u is always negative
∴ v = 2u
APPEARS IN
RELATED QUESTIONS
Give one use each of a concave and a convex mirror.
What is the name of the phenomenon in which the right side of an object appears to be the left side of the image in a plane mirror?
Mention the types of mirrors used as (i) rear view mirrors, (ii) shaving mirrors. List two reasons to justify your answers in each case.
Name the kind of mirror used to obtain:
A virtual and enlarged image
What is meant by magnification? Write its expression. What is its sign for the (a) real (b) virtual, image?
Which mirror will you prefer to use as a rear view mirror in a car : plane mirror or convex mirror? Give one reason.
Select the correct option:
A mirror forms a virtual image (diminished) of an object, whatever be the position of object:
Define the term principal focus in case of convex mirror. Draw a convex mirror and show its principal focus and focal length clearly.
The diagram below shows the parallel rays incident on a convex mirror. C is the centre of the curvature of the mirror. By drawing the paths of the reflected rays, label the focus F and hence find the focal length of the mirror.
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
