Ray Optics-Lens Maker's Formula and Lens Formula (NEET Physics): Questions 8 - 11 of 19

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Question number: 8

» Ray Optics » Lens Maker's Formula and Lens Formula

MCQ▾

Question

A convex lens of focal length 10.0 cm is placed in contact with a convex lens of 15.0 cm focal length. What is the focal length of the combination?

Choices

Choice (4) Response
a.

4 cm

b.

12 cm

c.

8 cm

d.

6 cm

Question number: 9

» Ray Optics » Lens Maker's Formula and Lens Formula

Assertion-Reason▾

Assertion (Ꭺ)

The focal length of lens changes when red light is replaced by blue light.

Reason (Ꭱ)

The focal length of lens does not depend on color of light used.

Choices

Choice (4) Response
a. Ꭺ is false but Ꭱ is true
b. Both Ꭺ and Ꭱ are false
c. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
d. Ꭺ is true but Ꭱ is false

Question number: 10

» Ray Optics » Lens Maker's Formula and Lens Formula

Assertion-Reason▾

Assertion (Ꭺ)

A double convex lens (µl=1.5) has focal length 10 cm. When the lens is immersed in water (µm=43) its focal length becomes 40 cm.

Reason (Ꭱ)

1f=μlμmμm(1R11R2)

Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
b. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
c. Ꭺ is false but Ꭱ is true
d. Both Ꭺ and Ꭱ are false

Question number: 11

» Ray Optics » Lens Maker's Formula and Lens Formula

MCQ▾

Question

A convex lens is made out of a substance of 1.2 refractive index. The two surfaces of lens are convex. If this lens is placed in water whose refractive index is 1.33 it will behave as:

Choices

Choice (4) Response
a.

Plane glass plate

b.

like a prism

c.

Convergent lens

d.

divergent lens

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