Optics Answers

You wish to create a real image with a magnification of −16 (that is an inverted image).

If you have a lens with a focal length of 15 cm, how far away should you place the object? (to 2 s.f and in cm)

The angular separation of a converging lens 3 cm in diameter and a focal length of 20 cm is .......

assume λ ( 550 nm  )

A person with myopia has a far point of 2.4 m. This person wears glasses to correct their vision.

If the person wears their glasses 1.5 cm from their eye, what is the optical power of the corrective lenses that allow them to see distant objects clearly? (to 2 s.f and in D)

An object of height 3.0 cm is placed at 25 cm in front of a diverging lens of focal length 20 cm. Behind the diverging lens, there is a converging lens of focal length 20 cm. The distance between the lenses is 5.0 cm. Find the location and size of the final image.

di = _____ cm

hi = _____ cm

An object of height 3.0 cm is placed at 5.0 cm in front of a diverging lens of focal length 20 cm and observed from the other side. Where and how large is the image?

di = _____ cm

hi = ______ m

answer to the nearest 1 decimal place

An object of height 3.0 cm is placed 5.0 cm in front of a converging lens of focal length 20 cm and observed from the other side. Where and how large is the image?

di = ______ cm

hi = _______ m

Suppose a 200 mm-focal length telephoto lens is being used to photograph mountains 10.0 km away.

(a) Where is the image? ______ m

(b) What is the height of the image of a 1000 m high cliff on one of the mountains? ______ m

A camera with a 89-mm focal length lens is being used to photograph a person standing 4.68 m away. How far from the lens must the film be (in m)?

answer to 3 decimal places

A camera lens used for taking close-up photographs has a focal length of 25 mm. The farthest it can be placed from the film is 44 mm. What is the magnification of this closest object?

answer to 3 decimal places

An object 3.112 cm high is held 4.00 cm from a person’s cornea, and its reflected image is measured to be 1.989 cm high.

(a) What is the magnification? _____

(b) Where is the image? ______ cm

(c) Find the radius of curvature of the convex mirror formed by the cornea. ______ cm

answer to the nearest 3 decimal places