Answer:
The range of powers is

Step-by-step explanation:
From the question we are told that
The far point of the left eye is

The near point of the left eye is

The near point with the glasses on is

From these parameter we can see that with the glass on that for near point the
Object distance would be

Image distance would be

To obtain the focal length we would apply the lens formula which is mathematically represented as

substituting values


converting to meters


Generally the power of the lens is mathematically represented as

Substituting values


From these parameter we can see that with the glass on that for far point the
Object distance would be

Image distance would be

To obtain the focal length of the lens we would apply the lens formula which is mathematically represented as

substituting values


converting to meters

Generally the power of the lens is mathematically represented as

Substituting values


This implies that the range of powers of the lens in his glass is
