Question

1. A lens forms an image of the object placed at a distance of 45cm from it on a screen placed at a distance 90cm on the other side of it.
a) Name the kind of lens
b) Find the focal length of the lens
c) Also find the power.
d) Find the Magnification of the lens.

2. A concave lens forms an image of the object kept at a distance 20cm in front of it, at a distance of 10cm on the side of the object.
a) Find the nature of the image.
b) Find the focal length of the lens.
c) Find the power.

3. A 10cm high object is placed 30 cm from a 20 cm focal length diverging lens. Determine the image distance, magnification, image height and other properties of the image.

4. A pin placed 40 cm from a lens forms an image on a screen placed at 80cm on the other side of the lens.
a) Determine the type of lens.
b) Find the focal length of lens.
c) Also find the power of the lens.

5. Power of a lens is -12D, find the focal length of the lens. Also mention the type of the lens. Give reason.

6. A lens has power +1.4D, find the focal length of the lens. Also mention the type of the lens. Give reason.​

Answer 1

Answer:

Explanation:

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