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3 years ago

Which statement is true of a concave lens?

Physics

2 answers:

natka813 [3]3 years ago

5 0

It produces only virtual images is the answer

vampirchik [111]3 years ago

3 0

Answer: The correct answer is Option A.

Explanation:

Concave lens is a type of spherical lens.

This lens is known as diverging lens which means that the light rays gets diverged after refraction.

The nature of the image formed by these lens is that they will be virtual, size of the image will be less than the object and the image formed will be upright.

Hence, from the above information, we conclude that the right answer is option A.

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4 years ago

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A force of 44 N will stretch a rubber band 88 cm (0.080.08 m). Assuming that Hooke's law applies, how far will aa 11-N forc

Setler79 [48]

Answer:

The rubber band will be stretched 0.02 m.

The work done in stretching is 0.11 J.

Explanation:

Force 1 = 44 N

extension of rubber band = 0.080 m

Force 2 = 11 N

extension = ?

According to Hooke's Law, force applied is proportional to the extension provided elastic limit is not extended.

F = ke

where k = constant of elasticity

e = extension of the material

F = force applied.

For the first case,

44 = 0.080K

K = 44/0.080 = 550 N/m

For the second situation involving the same rubber band

Force = 11 N

e = 550 N/m

11 = 550e

extension e = 11/550 = 0.02 m

The work done to stretch the rubber band this far is equal to the potential energy stored within the rubber due to the stretch. This is in line with energy conservation.

potential energy stored = $\frac{1}{2}ke^{2}$

==> $\frac{1}{2}* 550* 0.02^{2}$ = 0.11 J

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3 years ago