Question

*Physics HW: 1. Find v, h' & m when object of height 4 cm is placed at 40 cm from a convex mirror of focal length 30cm.* *2. Real image of height 6 cm is formed at a distance of 80 cm from lens when an object is placed in front of a convex lens of focal length 50cm. Find object distance and height of object.*​

Answer 1

GIVEN

• Size of object = 2cm
• Object distance, u = -15 cm
• Focal length, f = -10 cm

Applying mirror equation,

1/v +1/u = 1/f

to find out the image distance v = -30 cm using sign convention.

Using the formula of magnification for mirrors,

m = -v/u

magnification = -2

As magnification is greater than 1, the image is magnified and as it is negative it is real and inverted.

Also by using the formula of magnification, we get the size of image as 4 cm.

Answer 2

Answer:

*Physics HW: 1. Find v, h' & m when object of height 4 cm is placed at 40 cm from a convex mirror of focal length 30cm.* *2. Real image of height 6 cm is formed at a distance of 80 cm from lens when an object is placed in front of a convex lens of focal length 50cm. Find object distance and height of object.*