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Question 1:

Which of the following is a characteristic of a real image formed by a lens system?

A) Can be projected onto a screen
B) Cannot be seen directly
C) Always inverted
D) Always magnified

Show Answer

Explanation: The correct answer is A) Can be projected onto a screen. A real image formed by a lens system can be projected onto a screen. It is formed by the actual convergence of light rays and can be captured on a surface, resulting in a visible image.

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Question 2:

Which type of lens system can produce a magnified and upright image?

A) Converging lens system
B) Diverging lens system
C) Spherical lens system
D) Cylindrical lens system

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Explanation: The correct answer is A) Converging lens system. A converging lens system, such as a pair of converging lenses or a single converging lens with appropriate positioning, can produce a magnified and upright image. This occurs when the object is placed within the focal length of the lens system.

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Question 3:

Which type of lens system can produce a reduced and inverted image?

A) Converging lens system
B) Diverging lens system
C) Spherical lens system
D) Cylindrical lens system

Show Answer

Explanation: The correct answer is B) Diverging lens system. A diverging lens system, such as a pair of diverging lenses or a single diverging lens with appropriate positioning, can produce a reduced and inverted image. This occurs when the object is placed beyond the focal length of the lens system.

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Question 4:

Which of the following is true about a virtual image formed by a lens system?

A) Cannot be projected onto a screen
B) Can only be seen through a lens
C) Always upright
D) Always magnified

Show Answer

Explanation: The correct answer is A) Cannot be projected onto a screen. A virtual image formed by a lens system cannot be projected onto a screen. It is formed by the apparent divergence of light rays and cannot be captured on a surface, resulting in an image that is not visible without the aid of additional optical components.

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Question 5:

Which lens property determines the amount of bending of light in a lens system?

A) Focal length
B) Aperture size
C) Lens thickness
D) Refractive index

Show Answer

Explanation: The correct answer is D) Refractive index. The refractive index of a lens determines the amount of bending of light in a lens system. It is a measure of how much the lens material slows down light compared to its speed in a vacuum. Lenses with higher refractive indices bend light more.