281999 Which of the following statement is/are true regarding a light wave traveling from air to glass?
1. Its frequency remains unchanged
2. Its speed changes

281918 An object is placed at a distance of $12 \mathrm{~cm}$ in front of a plane mirror. The virtual and erect image is formed by the mirror. Now the mirror is moved by $\mathbf{4} \mathrm{cm}$ towards the stationary object. The distance by which the position of image would be shifted, will be:

281919 When one light ray is reflected from a plane mirror with $30^{\circ}$ angle of reflection, the angle of deviation of the ray after reflection is:

281920 The light rays from an object have been reflected towards an observer from a standard flat mirror, the image observed by the observer are:-

281999 Which of the following statement is/are true regarding a light wave traveling from air to glass?
1. Its frequency remains unchanged
2. Its speed changes

281918 An object is placed at a distance of $12 \mathrm{~cm}$ in front of a plane mirror. The virtual and erect image is formed by the mirror. Now the mirror is moved by $\mathbf{4} \mathrm{cm}$ towards the stationary object. The distance by which the position of image would be shifted, will be:

281919 When one light ray is reflected from a plane mirror with $30^{\circ}$ angle of reflection, the angle of deviation of the ray after reflection is:

281920 The light rays from an object have been reflected towards an observer from a standard flat mirror, the image observed by the observer are:-

281999 Which of the following statement is/are true regarding a light wave traveling from air to glass?
1. Its frequency remains unchanged
2. Its speed changes

281918 An object is placed at a distance of $12 \mathrm{~cm}$ in front of a plane mirror. The virtual and erect image is formed by the mirror. Now the mirror is moved by $\mathbf{4} \mathrm{cm}$ towards the stationary object. The distance by which the position of image would be shifted, will be:

281919 When one light ray is reflected from a plane mirror with $30^{\circ}$ angle of reflection, the angle of deviation of the ray after reflection is:

281920 The light rays from an object have been reflected towards an observer from a standard flat mirror, the image observed by the observer are:-

281999 Which of the following statement is/are true regarding a light wave traveling from air to glass?
1. Its frequency remains unchanged
2. Its speed changes

281918 An object is placed at a distance of $12 \mathrm{~cm}$ in front of a plane mirror. The virtual and erect image is formed by the mirror. Now the mirror is moved by $\mathbf{4} \mathrm{cm}$ towards the stationary object. The distance by which the position of image would be shifted, will be:

281919 When one light ray is reflected from a plane mirror with $30^{\circ}$ angle of reflection, the angle of deviation of the ray after reflection is:

281920 The light rays from an object have been reflected towards an observer from a standard flat mirror, the image observed by the observer are:-