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Power of a lens is –4 D, then its focal length is

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Important Questions on Optics

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Science Standard 10>Chapter 2 - Optics>TEXTBOOK EVALUATION>Q 7
In a myopic eye, the image of the object is formed
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Science Standard 10>Chapter 2 - Optics>TEXTBOOK EVALUATION>Q 8
The eye defect presbyopia can be corrected by
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Science Standard 10>Chapter 2 - Optics>TEXTBOOK EVALUATION>Q 9
Which of the following lens would you prefer to use while reading small letters found in a dictionary?
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Science Standard 10>Chapter 2 - Optics>TEXTBOOK EVALUATION>Q 10
If VB, VG, VR be the velocity of blue, green and red light respectively in a glass prism, then which of the following statement gives the correct relation?
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10th Tamil Nadu Board
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Science Standard 10>Chapter 2 - Optics>TEXTBOOK EVALUATION>Q 1
The path of the light is called as _____ (ray/beam) of light.
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Science Standard 10>Chapter 2 - Optics>TEXTBOOK EVALUATION>Q 2
The refractive index of a transparent medium is always greater than _____. 
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10th Tamil Nadu Board
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Science Standard 10>Chapter 2 - Optics>TEXTBOOK EVALUATION>Q 3
If the energy of incident beam and the scattered beam are same, then the scattering of light is called as _____ scattering.
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10th Tamil Nadu Board
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Science Standard 10>Chapter 2 - Optics>TEXTBOOK EVALUATION>Q 4
According to Rayleigh’s scattering law, the amount of scattering of light is inversely proportional to the fourth power of its _____.