When an object is placed 30 cm in front of a concave mirror image of the same size is formed what is the focal length of the mirror?

It will be found to be equal to 6 cm. Thus, object is placed at a distance of 6 cm × 5 = 30 cm from the lens. A concave lens of focal length 15 cm forms an image 10 cm from the lens.

When a bright object is placed 10 cm away from a concave mirror?

When a bright object is placed 10 cm away from a concave mirror, its real image is formed at a distance 40cm from the mirror.

Where must an object 2cm tall be placed in front of a concave mirror of radius of curvature 30cm if a real image 4cm tall is to be obtained?

Answer: An object is placed 2 cm in front of a concave mirror whose radius of curvature is 30 cm. This means that the object is well inside the mirrors focal length (15 cm).

When an object is placed at a distance of 15 cm from a convex lens a real image is formed at a distance of 30 cm What is the focal length of the lens?

The image formed by this combination is observed to coincide with the object itself. Find the focal length of the convex mirror. i.e., the image is formed at a distance of 30 cm.

When an object is placed 30 cm from a convex lens What is it called?

An object is placed 30 cm away from a convex lens of focal length 10 cm and a sharp image is formed on a screen. Now a concave lens is placed in contact with the convex lens. The screen now has to be moved by 45 cm to get a sharp image again. The magnitude of focal length of the concave len is (in cm)

Where should an object be placed in front of a convex lens of focal length 30cm?

60 cm. B.

30 cm. C.

15 cm. D.

25 cm. Hard. Solution. Verified by Toppr. B.

30 cm. For autocallination by system, light should fall normally on plane mirror, since mirror is perpendicular to the principal axis. Hence the object must lie on secondary focus of the lens. From the Ray diagram u=30cm.

Where should an object be placed in front of convex lens of focal length 30cm to obtain an image of magnification?

(a) To obtain, a real and magnified image,object must lie between f and 2f i.e., distance of flame from the lens should lie between 30 and 60cm.

What is the focal length of mirror at distance 30cm?

An Object of Length 4 Cm is Placed in Front of a Concave Mirror at Distance 30 Cm. the Focal Length of Mirror is 15 Cm. Where Will the Image Form? What Will Be the Length of Image? – Physics | Shaalaa.com An Object of Length 4 Cm is Placed in Front of a Concave Mirror at Distance 30 Cm. the Focal Length of Mirror is 15 Cm.

What is the distance in front of a concave mirror?

An image an by a concave mirror is 4 times greater than the object. If the radius of curvature 20 cm, determine the object distance in front of the mirror! The object distance = 12.5 cm. 4. A 1-cm high object is placed 10 cm from a concave mirror with the focal length, f = 15 cm. Determine :

What is the height of the image formed from the mirror?

Thus, screen should be placed 30 cm in front of the mirror (Centre of curvature) to obtain the real image. Thus, the height of the image is 2 cm and the negative sign means the image is inverted. Thus real, inverted image of size same as that of object is formed.

What distance from the mirror should a screen be placed?

An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focused image can be obtained? Find the size and the nature of the image. The screen must be placed at a distance of 54 cm from the mirror in front of it.