Question

an object 2 cm in size is placed 30 cm in front of a convex lens of focal length 15 cm. at what distance from a mirror a screen should be placed in order to obtain image?draw a ray diagram

Answer 1

Answer:

Explanation:

HELLO DEAR,

GIVEN:

size of object h = +2cm distance of object u = -30cm focal length f = -15cm

by mirror formula, 1/v + 1/u = 1/f

=> 1/v = 1/f-1/u

=> 1/v = 1/(-15) - 1/(-30)

=> 1/v = 1/30 - 1/15

=> 1/v = (1-2)/30

=> 1/v = -1/30

=> v= -30cm

the screen should be placed at 30cm in front of the mirror so, we obtain a real image

magnification, m = h'/h = -v/u where, h' = size of image

then, h'/h = -v/u

=> h'/2 = -(-30/-30)

=> h' = -2cm

hence, the image formed is real and the same size as object

I HOPE IT'S HELP YOU DEAR, THANKS

Answer 2

Answer:

Thus, the screen should placed at 30 cm in front of the mirror so as to obtain the real image. The image is real, inverted and of the same size as the object. The image formation is shown in the ray diagram given below. A concave lens of focal length 15 cm forms an image 10 cm from the lens.

hope it helps you ✅✅✅