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alex41 [277]
3 years ago
14

Why do plane mirrors and convex mirrors form only virtual images?

Physics
2 answers:
Alekssandra [29.7K]3 years ago
7 0
<span>B. because they cannot make light rays converge</span>
abruzzese [7]3 years ago
6 0

Answer:

B. because they cannot make light rays converge

Explanation:

When parallel beam of light incident of the plane mirror or convex mirror then light rays are reflected by the surface of mirror in such a way that it will not meet at any point of after the reflection.

So here the converging point of light rays are virtual point and hence we will say that its focal length is virtual focal length.

So here correct answer would be

B. because they cannot make light rays converge

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Violet light of wavelength 427 nm ejects electrons with a maximum kinetic energy of 0.684 eV from a certain metal. What is the w
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Answer:

The work function of the metal is 2.226 eV.

Explanation:

Given;

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The energy of the incident light is calculated as;

E = hf = \frac{hc}{\lambda} = \frac{6.626 \ \times \ 10^{-34} \ \times\ 3\ \times \ 10^8 }{427 \ \times \ 10^{-9}} = 4.655 \ \times \ 10^{-19} \ J\\\\1 \ eV = 1.6 \ \times \ 10^{-19} \ J\\\\E =( \frac{4.655 \ \times \ 10^{-19} \ J }{1.6 \ \times \ 10^{-19} \ J} ) \ eV\\\\E = 2.91 \ eV

Apply Einstein's photoelectric equation;

E = Ф + K.E

where;

Ф is the work function of the metal

Ф  = E - K.E

Ф  = 2.91 eV - 0.684 eV

Ф  = 2.226 eV.

Therefore, the work function of the metal is 2.226 eV.

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Answer:  Scattering reflection

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Explanation:

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