14.WHAT ARE THE APPLICATION OF LENS? VERY IMPORTANT
1.DO PRACTICE OF ALL THE RAY DIAGRAMS WITH DIFFERENT POSITION OF OBJECTS WITH CONVEX LENS AS WELL AS CONCAVE LENS.
2.COMPLETE ALL THE QUESTIONS GIVEN IN BACK EXCERSIZE.

Convex lenses are used to correct farsighted vision problems. Similarly, concave lenses are used to correct nearsightedness. Compound microscopes and telescopes use both convex and concave lenses. Using combinations of convex lenses may create blurry images.

b mirrors submit a iisner? e. for which optical devices does d sometimes have a positive value? o a a and b o b. a and c o c. b and d 0 d. b and cb

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards