![]() ![]() And meditation may help you manage symptoms of certain medical conditions. Meditation can help carry you more calmly through your day. Visitors can click on a particular category to see all posts related to that category.And these benefits don't end when your meditation session ends. AnswerĪll categories of this website are listed below with number of posts in each category for better navigation. Reason (R) : Virtual images are formed by diverging lenses only. Assertion(A): Virtual images are always erect. Reason (R) : In a concave mirror, image formed is real provided the object is situated beyond its focus. Assertion(A): A person cannot see his image in a concave mirror, unless, he is standing beyond the center of curvature of the mirror. Reason (R) : Laws of reflection are strictly valid for plane surfaces. Assertion(A) : The formula connecting u, v and f for a spherical mirror is valid in all situations for all spherical mirrors for all positions of the object. Reason (R) : The refractive index is a ratio of two similar quantities. Assertion(A) : Refractive index has no units. Reason (R) : When the face is held within the focus of a concave mirror, then a diminished image of the face is seen in the concave mirror. Assertion(A) : Concave mirrors are used as make-up mirrors. Reason (R) : An object is always placed above the principal axis in this upward direction. Assertion(A) : The height of an object is always considered positive. Reason (R) : The image formed by a plane mirror is as far behind the mirror as the object is in front of it. Assertion(A) : When the object moves with a velocity 2 m/s, its image in the plane mirror moves with a velocity of 4 m/s. Reason (R): The rays that seem to emanate from a virtual image do not in fact emanates from the image. Assertion(A) : It is not possible to see a virtual image by eye. Reason (R) : A plane mirror is a spherical mirror of infinite focal length. Assertion(A) : Mirror formula can be applied to a plane mirror. Reason (R) : A convex mirror has much larger field of view than a plane mirror. Assertion(A) : For observing traffic at back, the driver mirror is convex mirror. Assertion(A) : Light travels faster in glass than in air. Reason (R) : In concave spherical mirror the image formed is always virtual. Assertion(A): The mirrors used in search lights are concave spherical. Reason (R) : The speed of light is higher in a rarer medium than a denser medium. When it travels from a denser medium to a rarer medium, it speeds up and bends towards the normal. ![]() Assertion(A) : A ray of light travelling from a rarer medium to a denser medium slows down and bends away from the normal. Reason (R) : The extent of bending of the ray of light at the opposite parallel faces (air- glass interface and glass-air interface) of the rectangular glass slab is equal and opposite. Assertion(A) : The emergent ray is parallel to the direction of the incident ray. Reason (R) : The speed of light does not change as it enters from one transparent medium to another. Assertion (A) : Light does not travel in the same direction in all the media. Reason (R) : The incident rays fall on the mirror along the normal to the reflecting surface. Assertion (A) : A ray passing through the centre of curvature of a concave mirror after reflection, is reflected back along the same path. Reason (R) : The reflecting surface of a spherical mirror forms a part of a sphere. Assertion(A) : The centre of curvature is not a part of the mirror. (b) Both A and R are true but R is not the correct explanation of A. (a) Both A and R are true and R is the correct explanation of A. Answer these questions selecting the appropriate option given below: Following questions consist of two statements – Assertion (A) and Reason (R). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |