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Lostsunrise [7]

3 years ago

14

Light always follows one and the same path traveling back and forth. If a flashlight has a light bulb placed exactly in the foca

l point of its convex lens, it will produce a beam of..
A. converging light rays
B. diverging light rays
C. parallel light rays

1 answer:

Reil [10]3 years ago

5 0

Answer:

converging

.................

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A ray of light in glass strikes a water-glass interface at an angle of incidence equal to one-half the critical angle for that i

fomenos

Answer:

Explanation:

There will not be any internal reflection . it will be only refraction

critical angle = θ

Sinθ = 1 / μg

μg = 1.43 / 1.33 =

Sinθ = 1.33 / 1.43

= .93

θ = 68.44

angle of incidence i = 68.44 / 2

= 34.22

Sin i / Sin r = μw = 1.33 / 1.43

= .93

sin 34.22 / sinθ₁ = .93 , θ₁ is angle of refraction.

sinθ₁ = sin 34.22 / .93

= .5623 / .93

= .6047

θ₁ = 37 degree Ans

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Plz help me it’s a true or false question A shorter wire will allow electricity to

mr Goodwill [35]

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3 years ago

The masses of blocks A and B are 20kg and 10kg, respectively. The blocks are initially at rest on the floor and are connecte by

Goryan [66]

Answer

mass of the block A = 20 Kg

mass of block B = 10 Kg

acceleration of Block A = ?

acceleration of Block B = ?

Assuming the magnitude of force = 124 N

Applying newton's second law

F = 2 T

T = F/2

now, Tension in the string =

T = 124/2 = 62 N

Weight of the block A

W = m₁ g

W = 20 x 9.8 = 196 N

Weight of the block B

W = m₂ g

W = 10 x 9.8

W = 98 N

Weight of blocks is greater than force applied by the pulley so, the blocks will not move.

Hence, acceleration of the block A and B = 0 m/s²

If the Force magnitude is increased to 294 N

T = F/2 = 294/2 = 147 N

Since this Force is less than Weight A acceleration of the block A = 0 m/s².

For Block B

Tension is more than Weight hence block will move

Net Force = 147 - 98 = 49 N

acceleration = $\dfrac{F}{m}$

$a = \dfrac{49}{10}$

a = 4.9 m/s²

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3 years ago