Question

an object 2cm height is placed 20cm in front of concave mirrar of focal length 10cm? please answer send fast​

Answer 1

Correct Question :

An object of 2cm height is placed at 20cm in front of concave mirrar of focal length 10cm. Find position and size of the image.

Answer :

Position of object = 20cm

Height of object = 2cm

Focal length = 10cm

Type of mirror = concave

★ Focal length of concave mirror is taken negative$.$

Position of image can be calculated by using mirror formula.

➝ 1/u + 1/v = 1/f

➝ 1/(-20) + 1/v = 1/(-10)

➝ 1/v = -1/10 + 1/20

➝ 1/v = (-2 + 1)/20

➝ v = -1/20

➝ v = -20 cm

★ Size of image :

➠ m = -v/u = h'/h

• h' denotes height of image
• h denotes height of object

➠ h'/2 = -(-20)/(-20)

➠ h' = 2 × (-1)

➠ h' = -2 cm

Nature : Real and inverted!