Question

Match List-I with List-II. The optical instruments are listed in List-I and their lens/mirror types in List-II.

Choose the correct matching of instruments and their uses from the options given below:

• A. (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
• B. (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
• C. (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
• D. (A)-(II), (B)-(IV), (C)-(I), (D)-(III)

Answer 1

The Correct Option is B

Matching List-I (Optical Instruments) with List-II (Nature of Lens/Mirror Used):

Optical Instrument	Nature of Lens/Mirror Used	Correct Match
(A) Human eye	(III) Lens of adjustable focal length	A → III
(B) Microscope	(IV) Objective of small aperture and small focal length	B → IV
(C) Reflecting telescope	(I) Concave mirror of large aperture and large focal length	C → I
(D) Refracting telescope	(II) Objective lens of large aperture and large focal length	D → II

Final Matching:

• A → III: Human eye uses a lens with adjustable focal length (crystalline lens).
• B → IV: Microscope uses an objective lens with small aperture and small focal length for high magnification.
• C → I: Reflecting telescope uses a concave mirror with large aperture and large focal length to collect more light.
• D → II: Refracting telescope uses an objective lens with large aperture and large focal length for better resolution.

Answer 2

Let's analyze each optical instrument and the nature of the lens/mirror it uses:

• Human eye (A): The human eye has a lens whose focal length can be adjusted by the ciliary muscles. Therefore, it matches with (III) Lens of adjustable focal length.
• Microscope (B): A microscope typically uses an objective lens of small aperture and small focal length to achieve high magnification. Therefore, it matches with (IV) Objective of small aperture and small focal length.
• Reflecting telescope (C): Reflecting telescopes use a concave mirror of large aperture and large focal length to collect and focus light from distant objects. Therefore, it matches with (I) Concave mirror of large aperture and large focal length.
• Refracting telescope (D): Refracting telescopes use an objective lens of large aperture and large focal length to gather light and produce a magnified image. Therefore, it matches with (II) Objective lens of large aperture and large focal length.

 

Therefore, the correct matching is:

A - III (Human eye - Lens of adjustable focal length)
B - IV (Microscope - Objective of small aperture and small focal length)
C - I (Reflecting telescope - Concave mirror of large aperture and large focal length)
D - II (Refracting telescope - Objective lens of large aperture and large focal length)