What is the distance from a convex lens of focal length 20cm?

What distance from a convex lens is focal length 20 cm?

the answer is 40 cm infront of the lens.

How far should an object be placed from a convex lens of focal length 20cm to obtain its image at a distance of 90cm from the object?

An object should be placed at distance 60 cm from the convex lens.

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How far from a convex lens of focal length 20cm would you place an object to get an image and last three times?

u= -2 x 20/3 = -40/3 cm. Answer: Between the centre of the curvature and its focus, if the image is real.

At what distance the object should be placed from the lens of focal length 20cm so that it’s real and 2 times larger image is formed?

Since, the image is real, therefore magnification will be negative. Hence, object should be placed at a distance of 30 cm from the optical center of the convex lens.

Where will a convex lens of focal length 20cm?

A convex lens of focal length 20 cm is placed coaxially with a convex mirror of curvature 20 cm. The two are kept at 15cm apart from each other. A point object lies 60 cm in front of the convex lens. Draw a ray diagram to show the formation of the image by the combination.

At what distance should an object be placed from a convex lens of focal length 10 cm?

Calculate the distance at which an object should be placed in front of a convex lens of focal length 10 cm to obtain a virtual image of double its size. Here, u=?,f=10cm,m=+2, as image is virtual. Therefore, object should be placed at a distance of 5 cm from the lens.

Where should an object be placed in front of a convex lens of focal length 20cm so as to obtain a two times magnified real image?

Answer Expert Verified

so if you object be placed at the distance of 30 cm then the two times magnified image will be obtain. hope it help you.

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Where must be an object placed in front of a convex lens of focal length 20 cm to obtain a real and four times magnified image?

If the lens has a focal length of 20 cm, the object must be positioned 40 cm in front of the lens, creating an inverted image of the same size as the target, 40 cm behind the lens.

What will be the focal length of concave mirror of radius of curvature of 1m?

The answer is 0.5 m. Explanation: Focal length is the distance between the center of a lens and a convex or concave mirror.

What is the distance from a concave lens of focal length to 10cm?

So the object should be placed at a distance of 6.7 cm from the pole of the concave mirror (on the left, in front of the mirror).

At what distance from the object should the lens be placed?

Answer: The object should be placed at 50 cm away from the convex lens. Hence, The object should be placed at 50 cm away from the convex lens.

What is the focal length of a lens with 0.5 D?

Note: The power of the lens is said to be 1 dioptre if the focal length of the lens is 1metre. That means, if the corrective power of the lens is +0.5D, the required lens is a convex lens of focal length +2m.