Question

please answer my questions ​

Answer 1

Answer:

Explanation:

1 a) pole

2 b)negative

3 b)negative

4 a)positive

an anticlockwise moment is taken as positive and a clockwise moment is taken as negative. The direction of a moment depends upon the axis of rotation with respect to which you are measuring the turning effect

5 d) m=hi/ho

6 If the lower half was covered ,the size of the image will not vary.But the intensity of image will become less. as a result image will be blured so answer is option (d)

7 (c)

8 The minimum distance between an object and its real image in the case of a concave mirror is Zero. When the object is at the 2F distance i.e. the center of curvature, then the image is real and formed inverted at the same distance so option d is correct

9 Convex mirrors are commonly used as rear-view (wing) mirrors in vehicles because they give an erect, virtual, full size diminished image of distant objects with a wider field of view. Thus, convex mirrors enable the driver to view much larger area than would be possible with a plane mirror.

so  option (a) is correct

10 Concave mirrors are spherical mirrors with the curved surface facing inwards. ... Concave mirrors used by dentists are called “Mouth Mirrors”. They provide a clear and magnified image of the tiniest of the things in the mouth and thus help the dentist identify the problem.

so option (b) is correct