Find the position nature and size of the image of an formed by a convex lens of focal length 20 cm of an object 4 cm high placed at a distance of 30 cm from it.

Draw the ray diagrams and find position,nature and size of image formed by a convex lens,when object is placed:At F.

The size of the image of an object,which is at infinity, as formed by a convex lens of focal length 30 cm is 2 cm. If a concave lens of focal length 20 cm is placed between the convex lens and the image at a distance of 26 cm from the convex lens, calculate the new size of the image

A compound lens is made of a convex lens of power 10 D and a concave lens of power 5 D. An object 2 cm high is placed in front of this combination at a distance 40 cm from it. Find nature and size of the image formed.

A compound lens is made of a convex lens of power 10 D and a concave lens of power 5 D. An object 2 cm high is placed in front of this combination at a distance 40 cm from it. Find nature and size of the image formed.

An object of size 5 cm is placed at distance of 25 cm in front of a convex lens of focal length 20 cm. Find the size and nature of image and its distance from the lens.

A double convex lens made of glass of refactive index 1.56 has both radii of curvature of magnitude 20 cm.If an object is placed at a distance of 10 cm from this lens,find the positiojn of the image formed.

An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm.If the objects is displaced through a distance of 20 cm towards the mirror,by how much distance is the image displaced.

An object of size 10 cm is placed at distance of 20 cm in front of aconcave lens of focal length 20 cm. Find the size and nature of image. Also find distance of image from the lens