It is desired to project an image of an object four times actual size with a lens of focal length 20 ...

Author Question: It is desired to project an image of an object four times actual size with a lens of focal length 20 ... (Read 228 times)

fahad

Hero Member
Posts: 570

on: Jul 29, 2018

It is desired to project an image of an object four times actual size with a lens of focal length 20 cm. What object distance should be used?

A)

100 cm
B)

80 cm
C)

4 cm
D)

25 cm
E)

5 cm

Question 2

Alpha rays can penetrate

A)

air only.
B)

a piece of paper.
C)

several millimeters of aluminum.
D)

several centimeters of lead.
E)

several meters of iron.

234sdffa

Sr. Member
Posts: 341

Reply #1 on: Jul 29, 2018

Answer to Question 1

D

Answer to Question 2

B

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fahad

Hero Member
Posts: 570

Reply #2 on: Jul 29, 2018

234sdffa

Sr. Member
Posts: 341

Reply #3 on: Jul 29, 2018

You're welcome

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