If the lens having both the surface spherical,called a double convex or double concave lens,then is the lens having only one spherical surface called a single cnvex or a single concave lens ?

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Solution

No,
If the lens having one spherical surface then for concave lens it's called "Plano concave lens"
and for Covex lens it's called "Plano convex lens".

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A spherical mirror and a spherical lens each have a focal length of, -15 cm. The mirror and the lens are likely to be : (a) both concave. (b) both convex. (c) the mirror is concave but the lens is convex. (d) the mirror is convex but the lens is concave.

Q. Question 4
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If the lens having both the surface spherical,called a double convex or double concave lens,then is the lens having only one spherical surface called a single cnvex or a single concave lens ?

No, If the lens having one spherical surface then for concave lens it's called "Plano concave lens" and for Covex lens it's called "Plano convex lens".

No,
If the lens having one spherical surface then for concave lens it's called "Plano concave lens"
and for Covex lens it's called "Plano convex lens".