In the following question : if lens 1 has focal length 15 cm and lens

1.	In the following question : if lens 1 has focal length 15 cm and lens 2 has focal length 30 cm find which one has more power ? the solution given says to find power we should write 1/15cm where as in the video sir says 1D = 1/m so please clarify if we have to convert the 15cm to meters first or not.
Answer» In the following question : if lens 1 has focal length 15 cm and lens 2 has focal length 30 cm find which one has more power ? the solution given says to find power we should write 1/15cm where as in the video sir says 1D = 1/m so please clarify if we have to convert the 15cm to meters first or not.

In the following question : if lens 1 has focal length 15 cm and lens 2 has focal length 30 cm find which one has more power ? the solution given says to find power we should write 1/15cm where as in the video sir says 1D = 1/m so please clarify if we have to convert the 15cm to meters first or not.

Answer»

In the following question :

if lens 1 has focal length 15 cm and lens 2 has focal length 30 cm find which one has more power ?

the solution given says to find power we should write 1/15cm

where as in the video sir says 1D = 1/m

so please clarify if we have to convert the 15cm to meters first or not.