Ray Optics [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 67 - 71 of 160

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Question 67

Question MCQ▾

A convex lens of power 4D is kept in contact with a concave lens of power 3D, the effective power of combination will

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 68

Question MCQ▾

Two plane mirrors are inclined to each other at some angle. A ray of light incident at 30° on one, after reflection from the other retraces its path. The angle between the mirrors is

Choices

Choice (4)Response

a.

30°

b.

90°

c.

45°

d.

60°

Edit

Question 69

Question MCQ▾

A convex lens when placed in the first position forms a real image of an object on a fixed screen. The distance between the object and the screen is 75 cm. On displacing the lens from first position by 25 cm to the second position again a real image is formed on the screen. Then the focal length of the lens is

Choices

Choice (4)Response

a.

33.3 cm

b.

50.3 cm

c.

16.7 cm

d.

25.0 cm

Edit

Question 70

Question MCQ▾

A prism having an apex angle 4° and refraction index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror?

A Prism and Vertical Plan Mirror

Choices

Choice (4)Response

a.

178°

b.

c.

d.

176°

Edit

Question 71

Question MCQ▾

A short linear object of length b lies along the axis of a concave mirror of focal length f at a distance u from the pole of the mirror. Find the approximate size of the image.

Choices

Choice (4)Response

a.

b.

c.

d.

None of the above

Edit