Home 1st Year Physics Notes FSC 1st Year Physics Chapter 10 Short Questions Notes PDF

# FSC 1st Year Physics Chapter 10 Short Questions Notes PDF

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In this post, I am sharing FSC 1st Year Physics Chapter 10 Short Questions Notes PDF for the students of Class 11. This is chapter number 10 from the 11th physics textbook and its name is Optical Instruments. Students can download FSC 1st Year Physics Chapter 10 Short Questions Notes PDF on their laptop or mobile to read offline. These 1st Year Physics Notes are for all the boards working under Punjab Board like Gujranwala Board, Lahore Board, Faisalabad Board, Multan Board, Rawalpindi Board, Sargodha Board, DG Kahn Board, and Sahiwal Board. You can also download the complete FSC 1st Year Physics Notes PDF of all chapters from ilmihub.com.

## FSC Part 1 Physics Chapter 10 Short Questions Notes PDF Download

### What do you understand by linear magnification and angular? Explain how a convex lens is used as a magnifier?

Linear magnification:

The ratio of the size of the image to the size of the object is known as Linear magnification.

M = I/O = q/p

Angular Magnification:

The ratio of the angle made by the image through the optical device to the angle made by the object at the unaided eye is called angular magnification.

M = b/a

Convex Lens As A Magnifier:

If the object is placed inside the focal point of the convex lens. The magnified and virtual image Is formed at least a distance of distinct vision. In this way, a convex lens is used as a magnifier.

### Explain the difference between angular magnification and the resolving power of an optical instrument. What limits the magnification of an optical instrument?

Angular Magnification:

The ratio of the angle made by the image through the optical device to the angle made by the object at the unaided eye is called angular magnification
M =b/a

Resolving Power:

The resolving power of an instrument is its ability to reveal the minor details of the object under examination

R = 1/amin

Limited magnification:

The magnification of the optical instrument is limited due to the defects of the lenses such as chromatic and spherical aberrations.

### Define the term near point. Does it remain the same with age?

The normal human eye can focus a sharp image of an object located anywhere from infinity to a certain point called the near point. If an object is brought closer to the eye than the near point, the image formed on the eye will be blurred and fuzzy.

The near point increases with the increase in age.