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# CBSE Physics Ray Optics and Optical Instruments Test 1 Online

 Test Name Ray Optics and Optical Instruments Test Subject CBSE Physics Test Type MCQs Total Question 25 Total Marks 50 Total Time 20 Minutes Test Help For CBSE Physics. CBSE Board Exams. Entrance Exams. Admissions Test. Jobs Test. General Knowledge. All Grades Exams.

Central Board of Secondary Education, CBSE is main Board of Education in India to control all educational institutes Classes wise,  Physics all grades chapter wise test coverage guided material arrange in these test. Today our topic is Ray Optics and Optical Instruments test to prepare through recent syllabus. Electromagnetic Field that propagates through space carries a radiant energy. This energy can be divided into 7 radiation namely radio Waves, Micro Waves, Infrared, Visible Lights, Ultraviolet, X-Ray and Gamma Rays based on their wavelength. Take online quiz test for prepare more your knowledge about these fields.

## CBSE

1. There is a prism with refractive index equal to √2and the refracting angle equal to 30°. One of the refracting surface of the prism is polished. A beam of monochromatic will retrace its path if its angle of incidence over the refracting surface of the prism is ?

Question 1 of 15

2. A convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together. What will be their resulting power ?

Question 2 of 15

3. One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face, forms an image 12 cm behind the silvered face. The refractive index of the glass is ?

Question 3 of 15

4. Which of the following phenomenon is not explained by Huygen's construction of wavefront ?

Question 4 of 15

5. A ray is incident at an angle of incidence i on one surface of prism of small angle A and emerge normally from opposite surface. If the refractive index of the material of prism is μ, the angle of incidence i is nearly equal to ?

Question 5 of 15

6. Ray optics is valid, when characteristic dimensions are ?

Question 6 of 15

7. An astronomical telescope of ten-fold angular magnification has a length of 44 cm. The focal length of the objective is ?

Question 7 of 15

8. A point source of light is placed 4 m below the surface of water of refractive index 5/3. The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut off all light coming out of water is ?

Question 8 of 15

9. Light travels through a glass plate of thickness t and refractive index μ. If c is the speed of light in vacuum, the time taken by light to travel this thickness of glass is ?

Question 9 of 15

10. Angle of deviation (∂) by prism (refractive index = μ, and supposing the angle of prism A to be small) can be given by ?

Question 10 of 15

11. Pick out the longest wavelength from the following types of radiations ?

Question 11 of 15

12. The two mirrors are kept inclined at 60° to each other and a body is placed at the middle, then total number of images formed is ?

Question 12 of 15

13. The focal lengths of a converging lens measured for violet, green and red colours are fV, fG, fR respectively. We will find

Question 13 of 15

14. A beam of monochromatic light is refracted from vacuum into a medium of refractive index 1.5. The wavelength of refracted light will be ?

Question 14 of 15

15. Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal length of lens when immersed in a liquid of refractive index of 1.5 will be ?

Question 15 of 15

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