A laser projects light at a mirror. The mirror reflects the light as shown. The angle r is equal to _____ degree.

35

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Solution

The correct option is A 35

$∠ A O B = 55^{o}$
Also,
$∠ B O O^{'} = 90^{o}$ as it is normal
$∠ A O O^{'} = 90^{o} - 55^{o} = 35^{o}$
Therefore , i = 35°

According to law of reflection,
angle of incidence (i) = angle of reflection (r)
$i = r = 35^{o}$

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A laser projects light at a mirror. The mirror reflects the light as shown. The angle r is equal to _____ degree. 35

The correct option is A 35 ∠AOB=55o Also, ∠BOO′=90o as it is normal ∠AOO′=90o−55o=35o Therefore , i = 35° According to law of reflection, angle of incidence (i) = angle of reflection (r) i=r=35o

A laser projects light at a mirror. The mirror reflects the light as shown. The angle r is equal to _____ degree.

35

The correct option is A 35

$∠ A O B = 55^{o}$
Also,
$∠ B O O^{'} = 90^{o}$ as it is normal
$∠ A O O^{'} = 90^{o} - 55^{o} = 35^{o}$
Therefore , i = 35°

According to law of reflection,
angle of incidence (i) = angle of reflection (r)
$i = r = 35^{o}$