An object is placed on the principal axis of convex lens of focal length 10 cm as shown. A plane mirror is placed on the other side of lens at a…

Question

An object is placed on the principal axis of convex lens of focal length $10 cm$ as shown. A plane mirror is placed on the other side of lens at a distance of $20 cm$ . The image produced by the plane mirror is $5 cm$ inside the mirror. The distance of the object from the lens is ____ $cm$ .

MARKS Content Team · Accepted Answer

Correct answer: 30. Given here: Focal length of convex lens, f=10 cm Now, as seen in figure, image from lens is formed at point I_1, whose location is 5 cm from mirror. Thus, I_1 is at 15 cm from lens. Using lens equation, we have 1/v-1/u=1/f Putting the value, 1/15-1/(-u)=1/10 ⇒1/u=1/10-1/15⇒u=(10×15)/(10-15) Thus, object is placed at 30 cm from lens.

An object is placed on the principal axis of convex lens of focal length $10 cm$ as shown. A plane mirror is placed on the other side of lens at a distance of $20 cm$ . The image produced by the plane mirror is $5 cm$ inside the mirror. The distance of the object from the lens is ____ $cm$ .

Solution

Relevant Questions

An object is placed on the principal axis of convex lens of focal length 10 cm as shown. A plane mirror is placed on the other side of lens at a distance of 20 cm. The image produced by the plane mirror is 5 cm inside the mirror. The distance of the object from the lens is ____ cm.

Solution

Relevant Questions

An object is placed on the principal axis of convex lens of focal length $10 cm$ as shown. A plane mirror is placed on the other side of lens at a distance of $20 cm$ . The image produced by the plane mirror is $5 cm$ inside the mirror. The distance of the object from the lens is ____ $cm$ .