Question

A concave lens forms a virtual image when an object is placed at a distance of 18cm from it .the focal length will be
A . Greater than 36cm
B.greater than 18 cm
C.less than 18 cm
D.any of the above

Answer 1

HEY!............¶

THERE IS YOUR ANSWER......¶

When we place an object between the pole of the concave mirror and focus of it than a virtual and erect image is formed in front of it so

ACC to your question......

A virtual image is formed so the object distance of s lesser than the focal length of the mirror so the focal length is greater than 18cm

HOPE IT'S HELP YOU...........¶

∆ ANUBHAV VASHISHTHA ∆

^_^

Answer 2

Explanation:

greater than 18 cm

hope it helpful