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State the condition for the following a ray passes undeviated through the lens .
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If the angle of incidence is greater than the critical angle, light is not refracted at all, when it falls on the surface from a denser medium to a rarer medium.
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How is the power of a lens related to its focal length?
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How does the power of a lens change if its focal length is doubled?
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How is the sign (+ or -) of power of a lens related to its divergent or convergent action?
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On reducing the focal length of a lens, its power ______.
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The power of a lens is + 1.0 D is :
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Express the power (with sign) of a concave lens of focal length 20 cm.
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How is accommodation produced?
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Which lens has more power a thick lens or a thin lens?
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The power of a lens is +2.0 D. Find its focal length and state the kind of lens.
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A substance changes from its solid state to the liquid state when heat is supplied to it. Name the process.
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Which of the following is the radio isotope in pair?
\[\ce {^12_6 C , ^14_6 C}\]
Give reason for your answer.
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Which of the following is the radio isotope in pair?
\[\ce {^30_15 P , ^32_15 P}\]
Give reason for your answer.
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Which of the following is the radio isotope in pair?
\[\ce {^39_19 K , ^40_19 K}\]
Give reason for your answer.
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State the medical use of radioactivity.
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A ray of monochromatic light enters a liquid from the air as shown in the diagram given below:
Copy the diagram and show in the diagram the path of the ray of light after it strikes the mirror and re-enters the medium of air.
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