Find radius of the curvature of the concave mirror having focal length 7.5 cm

Question Id: PH0000002

Question: Find radius of the curvature of the concave mirror having focal length 7.5 cm.

To find: radius (r) of the curvature

Solution: 

we know the relation between focal length (f) and radius (r)  of curvature of mirror is

$$\Rightarrow f=\frac{r}{2}$$

$$\Rightarrow r=2 \times f$$

$$\Rightarrow r=2 \times 7.5$$

$$\Rightarrow r=15$$

∴ Hence radius of the curvature of the concave mirror is $15cm$ .(Answer) 

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