Q1. What is Focus?
Q2. What is lens formula?
Q3. What is the power of convex lens of focal length 0.5m?
Q4. Object is placed between focus and lens, image formed is enlarged and on
the same side as that of object. What is the nature of lens?
Q5. What are the laws of refraction of light?
Q6. State and prove law of refraction.
Q7. How does the tank appear to a viewer from outside?
Q8. Distinguish between convex and concave mirror.
Q9. How are power and focal length of lens related?
Q10. Draw the ray diagram showing the image formation by convex lens when
an object is placed. (a) between optical centre and focus of the lens. (b)at
twice the focal length of the lens.
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Answer:
The relation between power and focal length is p=1/f
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