An object is placed 40cm from a concave mirror of focal length 20cm. The image formed is(a) Real, inverted and same in size(b) Real, inverted and smaller(c) Virtual, erect and larger
(d) Virtual, erect and smaller
Answers
Answered by
22
answer : option (a) Real, inverted and same in size
explanation : object distance , u = -40cm
focal length of concave mirror, f = -20cm
use formula, 1/v + 1/u = 1/f
or, 1/v + 1/-40 = /-20
or, 1/v = 1/40 - 1/20
or, 1/v = 1/40 - 2/40 = 1/-40
hence, v = - 40cm
magnification, m = -v/u = -(-40)/-40 = -1
negative sign indicates that image is real and inverted and size of image is size of object.
hence the image formed is Real , inverted and same in size.
explanation : object distance , u = -40cm
focal length of concave mirror, f = -20cm
use formula, 1/v + 1/u = 1/f
or, 1/v + 1/-40 = /-20
or, 1/v = 1/40 - 1/20
or, 1/v = 1/40 - 2/40 = 1/-40
hence, v = - 40cm
magnification, m = -v/u = -(-40)/-40 = -1
negative sign indicates that image is real and inverted and size of image is size of object.
hence the image formed is Real , inverted and same in size.
Answered by
1
Explanation:
an object is placed 12 CM for mirror of focal length 20cm
Similar questions
Social Sciences,
7 months ago
English,
7 months ago
Physics,
1 year ago
Physics,
1 year ago
Geography,
1 year ago