Revision LIGHTS (408)

Which of the following is correct about the image of an object formed by a convex mirror?

• Virtual , upright , diminished

• Real , upright , diminished

• Virtual , inverted , magnify

• Real , inverted , magnify

Diagram 17 shows an object is placed in front of the plane mirror.

Which is the correct position of the image?

• A

• B

• C

• D

The depth of a swimming pool appears to be less than its actual depth. The light phenomenon which causes this is

• Reflection

• Interference

• Diffraction

• Refraction

Which diagram shows θ is critical angle of semicircular glass block ?

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Diagram 18 shows a ray of light is passing through the liquid and transparent sphere. If the refractive index of the liquid is higher

• V

• W

• Y

• Z

The critical angle of the liquid is 48⁰ .

Which diagram shows the total internal reflection?

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• 
• 

What is the function of an astronomical telescope ?

• To see small object

• To see large object

• To see distant object

• To see object above the water surface

Which of the instrument use the concept of total internal reflection?

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Diagram 19 shows a light ray travelling from medium X to air.

Calculate the refractive index of the medium X.

• 0.82

• 1.22

• 1.57

• 1.74

An experiment is carried out to determine the focal length of a convex lens. When the distance between the object and the image is 80 cm, the size of the image is the same as the size of the object.

What is the focal length of the convex lens?

• 10 cm

• 20 cm

• 30 cm

• 40 cm