The power of a lens is +4D. What is the nature of lens and what is its

1.	The power of a lens is +4D. What is the nature of lens and what is its focal length?Where an object should be placed in front of a concave mirror to get a real image of thesize of obiect?
Answer» <P>Answer:the power of a convex lens is always positive. as you can see here the power is +4D, therefore the nature of the lens is that it is a convex lens. we know, P = 1/f also the power of a lens is denoted in the TERMS of the unit dioptre (D). now putting the values in the equation 4D = 1/f therefore, f = 1/4 = 0.25 m in a concave mirror, youll get a real image as long as the OBJECT is between infinity and focus. size of the image depends upon the RELATIVE position of the object. pardon me for errors, if any Explanation:

The power of a lens is +4D. What is the nature of lens and what is its focal length?Where an object should be placed in front of a concave mirror to get a real image of thesize of obiect?

Answer»

<P>Answer:the power of a convex lens is always positive. as you can see here the power is +4D, therefore the nature of the lens is that it is a convex lens.

we know,

P = 1/f

also the power of a lens is denoted in the TERMS of the unit dioptre (D).

now putting the values in the equation

4D = 1/f

therefore, f = 1/4 = 0.25 m

in a concave mirror,

youll get a real image as long as the OBJECT is between infinity and focus.

size of the image depends upon the RELATIVE position of the object.

pardon me for errors, if any

Explanation:

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