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

Now, to get a virtual image by the concave mirror, the object distance must be less than focal length. Hence, the required maximum object distance is **10 cm**. Option B is the correct answer.

## How far from a convex lens of focal length 20cm would you place an object to get an image enlarged 3 times?

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

## 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.

## Where will a convex lens of focal length 20 cm from an image of an object placed at 40 cm away from it?

From above data we have; Focal length (f) of convex lens is 20 cm and image distance (v) is 40 cm. (Image formed is real.) Therefore, the object distance from the lens is 40 cm. As, the image distance and object distance from the lens is same; means the object is placed **at C** due to this image is also formed at C.

## What is the power of a convex lens of focal length 10cm?

This point is called the focal point of the convex lens and the distance from the optical centre to the focal point is called the focal length. **p = 10 D**.

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## Is shaving mirror concave or convex?

Therefore, shaving mirrors are **concave mirrors**. Additional information: Concave and convex mirrors are called spherical mirrors. Because the reflecting surface of these mirrors is spherical.

## 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.

## How far an object should be placed from a concave mirror of power 5d to obtain an image magnified three times?

Answer Expert Verified

so the object must be placed **30 cm** from the mirror.

## What is the power of a convex lens of focal length 40cm?

So, Power of convex lens is **+ 2.5 D**.

## What is the power of a convex lens of focal length 50 cm?

= 100/50 = **2 dioptre**. The SI unit of power is dioptre.