Assertion and Reason questions on class 12 Physics Chapter 9 Ray Optics and Optical Instruments

Last modified on:2 years ago
Reading Time:9Minutes

Home » CBSE Class 12 Physics » Assertion Reason Questions for Class 12 Physics » Assertion and Reason questions on class 12 Physics Chapter 9 Ray Optics and Optical Instruments

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

Q.1. Assertion : Plane mirror may form real image.
Reason : Plane mirror forms virtual image, if object is real.

Answer

Q.2. Assertion : The focal length of the convex mirror will increase, if the mirror is placed in water.
Reason : The focal length of a convex mirror of radius R is equal to , f = R/2.

Answer

(d) Focal length of the spherical mirror does not depend on the medium in which it placed.

Q.3. Assertion : The image formed by a concave mirror is certainly real if the object is virtual.
Reason : The image formed by a concave mirror is certainly virtual if the object is real.

Answer

Q.4. Assertion : The image of an extended object placed perpendicular to the principal axis of a mirror, will be erect if the object is real but the image is virtual.
Reason : The image of an extended object, placed perpendicular to the principal axis of a mirror, will be erect if the object is virtual but the image is real.

Answer

Q.5. Assertion : An object is placed at a distance of f from a convex mirror of focal length f its image will form at infinity.
Reason : The distance of image in convex mirror can never be infinity

Answer

Q.6. Assertion : The image of a point object situated at the centre of hemispherical lens is also at the centre.
Reason : For hemisphere Snell’s law is not valid.

Answer

(c) The rays from centre of hemisphere cut at the centre after refraction – Snell’s law is valid in each case of refraction.

Q.7. Assertion: The focal length of an equiconvex lens of radius of curvature R made of material of refractive index μ = 1.5, is R.
Reason : The focal length of the lens will be R/2.

Answer

(c)

Q.8. Assertion : If the rays are diverging after emerging from a lens; the lens must be concave.
Reason : The convex lens can give diverging rays.

Answer

(d) If the rays cross focal point of convex lens, they become diverging.

Q.9. Assertion : The resolving power of a telescope is more if the diameter of the objective lens is more.
Reason : Objective lens of large diameter collects more light.

Answer

(a) RP α diameter of objective.

Q.10. Assertion : The optical instruments are used to increase the size of the image of the object.
Reason : The optical instruments are used to increase the visual angle.

Answer

(d)

You may also like:

Table of Contents

Category Lists (All Posts)

Select Category

All categories of this website are listed below with number of posts in each category for better navigation. Visitors can click on a particular category to see all posts related to that category.

Test Series (Engineering, Medical and School Level Exams)

Test series for students preparing for Engineering & Medical Entrance Exams are available. We also provide test series for School Level Exams. Tests for students studying in CBSE, ICSE or any state board are available here. Just click on the link and start test.

Click here for All Tests

In order to equip the students with the latest methodology of testing and evaluation in competitive exam segment in India Physics Gurukul has introduced successrouter.com for Online Testing and Assessment. Try our free tests for JEE and NEET Today!

Download Books – Exam Special

CBSE Books	ICSE Books
OLYMPIAD Books	FOUNDATION Books
JEE Books	NEET Books

➡ Click below titles to expand

➤ Download CBSE Books

Download Class-wise Books for CBSE

➤ Download ICSE Books

Download Class-wise ICSE Books

Download Class-wise ISC Books

➤ Download JEE & NEET Books

➤ Download Foundation/Olympiad Books

➤ Download Sample Papers – CBSE, ICSE & ISC

Sample Papers for CBSE 2025 Exams

➤ Most Downloaded CBSE Books

CBSE Class 10 Most Downloaded Books

CBSE Class 12 Most Downloaded Books

CBSE Class 8 Most Downloaded Books

Worksheets for CBSE Class 8 Maths – Chapterwise

➤ Most Downloaded ICSE Books

ICSE Class 10

ICSE Class 9

➤ Download Chapter wise Test Papers

CBSE Chapter-Wise Test Papers

Announcements

✨Join our Online NEET Test Series for 499/- Only for 1 Year

Join Now!

Join Our Telegram Channel

Join our Telegram Channel for Free PDF Download

Join Now!

Download Product Brochure (Editable Study Materials)

Download Product Brochure

Download CBSE and ICSE Books in PDF Format

Assertion and Reason questions on class 12 Physics Chapter 9 Ray Optics and Optical Instruments

You May Also Like:

Category Lists (All Posts)

Download Books – Exam Special

2 thoughts on “Assertion and Reason questions on class 12 Physics Chapter 9 Ray Optics and Optical Instruments”

Leave a ReplyCancel reply

You May Also Like:

Category Lists (All Posts)

Download Books – Exam Special

2 thoughts on “Assertion and Reason questions on class 12 Physics Chapter 9 Ray Optics and Optical Instruments”

Leave a ReplyCancel reply

Discover more from Gurukul of Excellence