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Sashank

23/11/2018 0 0

What is focal length?

Ans: the distance between the pole and focal point.

What is the relationship between the radius of curvature and focal length?

Ans: R=2f

What is myopia?

When a person can see near things clearly but can't see distant objects is called myopia.

Which lens do we use to correct myopia?

Concave lens

What is the cause of myopia?

I. Elongation of eyeball

II. Increase the curvature of the lens

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नोट– राम , नृप , गज , वानर, सर्प , कूप , तड़ाग , वृक्ष ,मनुष्य , मयूर , नाग , सिंह , खग , पाद , कुक्कुर , व्याघ्र , इंद्र , गणेश , जनक , कर, अश्व , सेवक ,चंद्र , छात्र , ईश्वर आदि शब्दों के रूप ...

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