Daily Practice Problems Ray Optics and Optical Instruments

Question 1:

Mirage phenomenon is due to

(a) refraction of light

(b) reflection of light

(d) diffraction of light

Question 2:

If a glass prism is dipped in water, what happens to its dispersive power?

(a) Increases

(b) Decreases

(d) No effect

Question 3:

What is the refractive index of Crown glass?

(a) 2.42

(b) 1.62

(d) 1.33

Question 4:

What is the critical angle of Diamond?

(a) 37.31

(b) 24.41

(d) None

Question 5:

Which of the following light deviates the most when it passes through a prism?

(a) Red Light

(b) Violet Light

(d) Both (a) and (b)

Question 6:

An astronomical telescope has a large aperture to

(a) reduce spherical aberration

(b) have high resolution

(d) have low dispersion

Question 7:

Which of the following is not due to total internal reflection?

(a) Working of optical fibre

(b) Difference between apparent and real depth of pond

(d) Brilliance of diamond

Question 8:

In a compound microscope, the objective lens of f_o and eyepiece of f_e are placed at distance L such that L equals

(a) f_o + f_e

(b) f_o + f_e

(d) much less than f_o or f_e

Question 9:

For which of the following is the field of view maximum?

(a) Concave mirror

(b) Convex mirror

(d) Cylindrical mirror

Question 10:

The image formed by an objective lens of a compound microscope is

(a) virtual and diminished

(b) real and diminished

(d) virtual and enlarged

Question 11:

Write the necessary conditions for the phenomenon of total internal reflection to take place.

Question 12:

An object 0.5 cm high is placed 30 cm from a convex mirror whose focal length is 20 cm. Find the position, size, and nature of the image.

Question 13:

A ray of light incident at 49° on the face of an equilateral prism passes symmetrically. Calculate the refractive index of the material of the prism.

Question 14:

The magnifying power of an astronomical telescope in the normal adjustment position is 100. The distance between the objective and eyepiece is 101 cm. Calculate the focal lengths of the objective and of the eyepiece.

Question 15:

A prism of refractive index of has a refracting angle of 60°. At what angle must a ray be incident on it so that it suffers a minimum deviation?

Question 16:

The refractive index of the material of a concave lens is μ₁. It is immersed in a medium of refractive index μ₂. A parallel beam of light is incident on the lens. Trace the path of emergent rays when μ₂ < μ₁.

Question 17:

A person standing before a concave mirror cannot see his image, unless he is beyond the centre of curvature. Why?

Question 18:

A converging and diverging lens of equal focal lengths are placed coaxially in contact. Find the focal length and power of combination.

Question 19:

Birds flying high in the air appear to be higher than in reality. Explain why?

Question 20:

(i) If f = 0.5 m for a glass lens, what is the power of the lens?

(ii) The radii of curvature of the faces of a double convex lens are 10 cm and 15 cm. Its focal length is 12 cm. What is the refractive index of glass?

(iii) A convex lens has 20 cm focal length in air. What is focal length in water? (Refractive index of air-water = 1.33, refractive index for air-glass = 1.5.)

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All About Daily Practice Problems on Class 12 Physics Ray Optics and Optical Instruments NCERT Chapter 9

Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 12 Physics Ray Optics and Optical Instruments NCERT Chapter 9 useful.

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