# A lens of focal length 20cm

A mirror formula may be defined as the formula which gives the relationship between the distance of image v, distance of object u, and the focal length of a mirror.

A concave mirror of focal length 20 cm and a convex lens of focal length 10 cm are kept with their optic axes parallel but separated by 0. The distance between the the lens and mirror in 10 cm. An object of height 3 mm is placed on the optic axis of lens at a distance between the lens and mirror is 10 cm. An object of height 3 mm is placed on the optic axis of lens at a distance 15 cm from the lens. Find the length of the image formed the mirror in mm. A convex lens of focal length 20 cm is placed in front of a convex mirror of focal length 15 cm at a distance of 5 cm. An object of length 2 cm is placed perpendicular to the common axis at a distance of 20 cm from the lens.

## A lens of focal length 20cm

Thus, the object is at a distance of 60 cm from the concave lens, and the negative sign implies that it is on the left side of it. Menu Categories. A concave lens has a focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens? Also calculate the size of the image formed. Tutorialspoint Simply Easy Learning. Updated on: Oct Related Articles A concave lens has focal length 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? Also find the magnification produced by the lens. A concave lens of 20 cm focal length forms an image 15 cm from the lens. Compute the object distance.

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A convex lens of focal length 30 cm produces 5 times magnified real image of an object. What is the object distance? A convex lens of focal length f will form a magnified real image of an object if the object is placed. A convex lens of focal length f produces a virtual image n times the size of the object. Then the distance of the object from the lens is.

A divergent lens has a focal length of 20 c m. At what distance should an object of height 4 c m from the optical centre of the lens be placed so that its image is formed 10 c m away from the lens. Find the size of the image also. In the case of concave lens, the image is always formed in front of the lens, so the image distance will be negative. The height of the object h o is 4 c m. Where m is the magnification of the lens. Substitute all the values into the lens formula to calculate the object distance.

### A lens of focal length 20cm

The image of a candle flame placed at a distance 36 cm from a spherical lens is formed on a screen placed at a distance of 72 cm from the lens. Identify the type of lens and calculate its focal length. If the height of the flame is 2. Use app Login.

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A point object is placed at a distance of 18 cm from a convex lens on its principal axis. Its image is formed on the other side of the lens at 27 cm.

Punjab Pre-Primary Teacher. Goa Police Sub Inspector. How far from a convex lens of focal length 20 cm would you place an object to get a real image enlarged three times? CG Vyapam SI. The lens whose refracting surface is upside is called a convex lens. GPSC Class An object of height 3 mm is placed on the optic axis of lens at a distance between the lens and mirror is 10 cm. Yes, a convex lens of focal length 20 c m can produce a magnified virtual as well as real image. BEL Trainee Engineer. Indian Army Group C. A convex lens of focal length f will form a magnified real image of an object if the object is placed.

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